356640631 has 2 divisors, whose sum is σ = 356640632. Its totient is φ = 356640630.

The previous prime is 356640623. The next prime is 356640689. The reversal of 356640631 is 136046653.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 356640631 - 2³ = 356640623 is a prime.

It is a super-2 number, since 2×356640631² = 254385079360156322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (356640601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 178320315 + 178320316.

It is an arithmetic number, because the mean of its divisors is an integer number (178320316).

Almost surely, 2^356640631 is an apocalyptic number.

356640631 is a deficient number, since it is larger than the sum of its proper divisors (1).

356640631 is an equidigital number, since it uses as much as digits as its factorization.

356640631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 356640631 is about 18884.9313210295. The cubic root of 356640631 is about 709.1589797088.

The spelling of 356640631 in words is "three hundred fifty-six million, six hundred forty thousand, six hundred thirty-one".