47431557 has 6 divisors (see below), whose sum is σ = 68512262. Its totient is φ = 31621032.

The previous prime is 47431529. The next prime is 47431561. The reversal of 47431557 is 75513474.

It is a happy number.

47431557 is a `hidden beast` number, since 4 + 74 + 31 + 557 = 666.

It can be written as a sum of positive squares in only one way, i.e., 43046721 + 4384836 = 6561^2 + 2094^2 .

It is not a de Polignac number, because 47431557 - 2¹⁰ = 47430533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47431057) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2635078 + ... + 2635095.

Almost surely, 2^47431557 is an apocalyptic number.

It is an amenable number.

47431557 is a deficient number, since it is larger than the sum of its proper divisors (21080705).

47431557 is a wasteful number, since it uses less digits than its factorization.

47431557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270179 (or 5270176 counting only the distinct ones).

The product of its digits is 58800, while the sum is 36.

The square root of 47431557 is about 6887.0572089972. The cubic root of 47431557 is about 361.9837935217.

The spelling of 47431557 in words is "forty-seven million, four hundred thirty-one thousand, five hundred fifty-seven".