47557681 has 4 divisors (see below), whose sum is σ = 47994100. Its totient is φ = 47121264.

The previous prime is 47557673. The next prime is 47557693. The reversal of 47557681 is 18675574.

47557681 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.

It can be written as a sum of positive squares in 2 ways, for example, as 25090081 + 22467600 = 5009^2 + 4740^2 .

It is a cyclic number.

It is not a de Polignac number, because 47557681 - 2³ = 47557673 is a prime.

It is a super-2 number, since 2×47557681² = 4523466044195522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47557621) 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, 218046 + ... + 218263.

It is an arithmetic number, because the mean of its divisors is an integer number (11998525).

Almost surely, 2^47557681 is an apocalyptic number.

It is an amenable number.

47557681 is a deficient number, since it is larger than the sum of its proper divisors (436419).

47557681 is a wasteful number, since it uses less digits than its factorization.

47557681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436418.

The product of its digits is 235200, while the sum is 43.

The square root of 47557681 is about 6896.2077259897. The cubic root of 47557681 is about 362.3043567360.

The spelling of 47557681 in words is "forty-seven million, five hundred fifty-seven thousand, six hundred eighty-one".