47817881 has 4 divisors (see below), whose sum is σ = 48085200. Its totient is φ = 47550564.

The previous prime is 47817859. The next prime is 47817883. The reversal of 47817881 is 18871874.

47817881 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47817881 - 2¹⁴ = 47801497 is a prime.

It is a super-2 number, since 2×47817881² = 4573099486660322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47817883) 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, 133391 + ... + 133748.

It is an arithmetic number, because the mean of its divisors is an integer number (12021300).

Almost surely, 2^47817881 is an apocalyptic number.

It is an amenable number.

47817881 is a deficient number, since it is larger than the sum of its proper divisors (267319).

47817881 is a wasteful number, since it uses less digits than its factorization.

47817881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267318.

The product of its digits is 100352, while the sum is 44.

The square root of 47817881 is about 6915.0474329537. The cubic root of 47817881 is about 362.9639080044.

The spelling of 47817881 in words is "forty-seven million, eight hundred seventeen thousand, eight hundred eighty-one".