657400131 has 10 divisors (see below), whose sum is σ = 982042292. Its totient is φ = 438266700.

The previous prime is 657400091. The next prime is 657400141. The reversal of 657400131 is 131004756.

657400131 is a `hidden beast` number, since 657 + 4 + 0 + 0 + 1 + 3 + 1 = 666.

It is not a de Polignac number, because 657400131 - 2⁶ = 657400067 is a prime.

It is a super-2 number, since 2×657400131² = 864349864477634322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 657400095 and 657400104.

It is not an unprimeable number, because it can be changed into a prime (657400141) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4057945 + ... + 4058106.

Almost surely, 2^657400131 is an apocalyptic number.

657400131 is a deficient number, since it is larger than the sum of its proper divisors (324642161).

657400131 is an equidigital number, since it uses as much as digits as its factorization.

657400131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8116063 (or 8116054 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 657400131 is about 25639.8153464490. The cubic root of 657400131 is about 869.5140329973.

Adding to 657400131 its reverse (131004756), we get a palindrome (788404887).

The spelling of 657400131 in words is "six hundred fifty-seven million, four hundred thousand, one hundred thirty-one".