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47872081 = 101473981
BaseRepresentation
bin1011011010011…
…1100001010001
310100002011011001
42312213201101
544223401311
64430022001
71120622515
oct266474121
9110064131
1047872081
1125028004
1214047901
139bc199a
146502145
1543094c1
hex2da7851

47872081 has 4 divisors (see below), whose sum is σ = 48346164. Its totient is φ = 47398000.

The previous prime is 47872067. The next prime is 47872093. The reversal of 47872081 is 18027874.

47872081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18027874 = 29013937.

It can be written as a sum of positive squares in 2 ways, for example, as 37015056 + 10857025 = 6084^2 + 3295^2 .

It is a cyclic number.

It is not a de Polignac number, because 47872081 - 213 = 47863889 is a prime.

It is a super-2 number, since 2×478720812 = 4583472278541122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47872081.

It is not an unprimeable number, because it can be changed into a prime (47872021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236890 + ... + 237091.

It is an arithmetic number, because the mean of its divisors is an integer number (12086541).

Almost surely, 247872081 is an apocalyptic number.

It is an amenable number.

47872081 is a deficient number, since it is larger than the sum of its proper divisors (474083).

47872081 is a wasteful number, since it uses less digits than its factorization.

47872081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474082.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 47872081 is about 6918.9653128195. The cubic root of 47872081 is about 363.1009921196.

The spelling of 47872081 in words is "forty-seven million, eight hundred seventy-two thousand, eighty-one".

Divisors: 1 101 473981 47872081