137986631 has 2 divisors, whose sum is σ = 137986632. Its totient is φ = 137986630.

The previous prime is 137986621. The next prime is 137986633. The reversal of 137986631 is 136689731.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 137986631 - 2²² = 133792327 is a prime.

It is a super-2 number, since 2×137986631² = 38080620669460322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 137986633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137986633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68993315 + 68993316.

It is an arithmetic number, because the mean of its divisors is an integer number (68993316).

Almost surely, 2^137986631 is an apocalyptic number.

137986631 is a deficient number, since it is larger than the sum of its proper divisors (1).

137986631 is an equidigital number, since it uses as much as digits as its factorization.

137986631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The square root of 137986631 is about 11746.7710882608. The cubic root of 137986631 is about 516.7482371847.

The spelling of 137986631 in words is "one hundred thirty-seven million, nine hundred eighty-six thousand, six hundred thirty-one".