137664931 has 2 divisors, whose sum is σ = 137664932. Its totient is φ = 137664930.

The previous prime is 137664883. The next prime is 137664941. The reversal of 137664931 is 139466731.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 137664931 - 2¹⁵ = 137632163 is a prime.

It is a super-2 number, since 2×137664931² = 37903266454469522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (137664941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68832465 + 68832466.

It is an arithmetic number, because the mean of its divisors is an integer number (68832466).

Almost surely, 2^137664931 is an apocalyptic number.

137664931 is a deficient number, since it is larger than the sum of its proper divisors (1).

137664931 is an equidigital number, since it uses as much as digits as its factorization.

137664931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 40.

The square root of 137664931 is about 11733.0699733701. The cubic root of 137664931 is about 516.3463449567.

The spelling of 137664931 in words is "one hundred thirty-seven million, six hundred sixty-four thousand, nine hundred thirty-one".