646602731 has 2 divisors, whose sum is σ = 646602732. Its totient is φ = 646602730.

The previous prime is 646602721. The next prime is 646602757. The reversal of 646602731 is 137206646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646602731 - 2²⁶ = 579493867 is a prime.

It is a super-2 number, since 2×646602731² = 836190183473316722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 646602691 and 646602700.

It is not a weakly prime, because it can be changed into another prime (646602721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323301365 + 323301366.

It is an arithmetic number, because the mean of its divisors is an integer number (323301366).

Almost surely, 2^646602731 is an apocalyptic number.

646602731 is a deficient number, since it is larger than the sum of its proper divisors (1).

646602731 is an equidigital number, since it uses as much as digits as its factorization.

646602731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 646602731 is about 25428.3843568560. The cubic root of 646602731 is about 864.7273160101.

The spelling of 646602731 in words is "six hundred forty-six million, six hundred two thousand, seven hundred thirty-one".