164688631 has 2 divisors, whose sum is σ = 164688632. Its totient is φ = 164688630.

The previous prime is 164688607. The next prime is 164688661. The reversal of 164688631 is 136886461.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164688631 is a prime.

It is a super-2 number, since 2×164688631² = 54244690361308322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164688661) 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, 82344315 + 82344316.

It is an arithmetic number, because the mean of its divisors is an integer number (82344316).

Almost surely, 2^164688631 is an apocalyptic number.

164688631 is a deficient number, since it is larger than the sum of its proper divisors (1).

164688631 is an equidigital number, since it uses as much as digits as its factorization.

164688631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 43.

The square root of 164688631 is about 12833.1068334990. The cubic root of 164688631 is about 548.1354281498.

The spelling of 164688631 in words is "one hundred sixty-four million, six hundred eighty-eight thousand, six hundred thirty-one".