657238131 has 20 divisors (see below), whose sum is σ = 1071056184. Its totient is φ = 398325600.

The previous prime is 657238129. The next prime is 657238151. The reversal of 657238131 is 131832756.

657238131 is a `hidden beast` number, since 6 + 572 + 3 + 81 + 3 + 1 = 666.

657238131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 657238131 - 2¹ = 657238129 is a prime.

It is a super-2 number, since 2×657238131² = 863923921680746322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (657238151) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 367930 + ... + 369711.

Almost surely, 2^657238131 is an apocalyptic number.

657238131 is a deficient number, since it is larger than the sum of its proper divisors (413818053).

657238131 is a wasteful number, since it uses less digits than its factorization.

657238131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737664 (or 737655 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 657238131 is about 25636.6560026849. The cubic root of 657238131 is about 869.4426037216.

The spelling of 657238131 in words is "six hundred fifty-seven million, two hundred thirty-eight thousand, one hundred thirty-one".