646712131 has 12 divisors (see below), whose sum is σ = 716579688. Its totient is φ = 583075584.

The previous prime is 646712089. The next prime is 646712141. The reversal of 646712131 is 131217646.

It is a de Polignac number, because none of the positive numbers 2^k-646712131 is a prime.

It is a super-2 number, since 2×646712131² = 836473160765122322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646712093 and 646712102.

It is not an unprimeable number, because it can be changed into a prime (646712141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37230 + ... + 51763.

It is an arithmetic number, because the mean of its divisors is an integer number (59714974).

Almost surely, 2^646712131 is an apocalyptic number.

646712131 is a deficient number, since it is larger than the sum of its proper divisors (69867557).

646712131 is a wasteful number, since it uses less digits than its factorization.

646712131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89062 (or 89049 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 646712131 is about 25430.5354052957. The cubic root of 646712131 is about 864.7760815705.

Adding to 646712131 its reverse (131217646), we get a palindrome (777929777).

The spelling of 646712131 in words is "six hundred forty-six million, seven hundred twelve thousand, one hundred thirty-one".