137897631 has 12 divisors (see below), whose sum is σ = 204569352. Its totient is φ = 89446896.

The previous prime is 137897621. The next prime is 137897633. The reversal of 137897631 is 136798731.

137897631 is a `hidden beast` number, since 1 + 3 + 7 + 8 + 9 + 7 + 631 = 666.

It is not a de Polignac number, because 137897631 - 2¹⁰ = 137896607 is a prime.

It is a super-2 number, since 2×137897631² = 38031513270824322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137897633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 206721 + ... + 207386.

It is an arithmetic number, because the mean of its divisors is an integer number (17047446).

Almost surely, 2^137897631 is an apocalyptic number.

137897631 is a deficient number, since it is larger than the sum of its proper divisors (66671721).

137897631 is a wasteful number, since it uses less digits than its factorization.

137897631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414150 (or 414147 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 137897631 is about 11742.9822021495. The cubic root of 137897631 is about 516.6371141381.

The spelling of 137897631 in words is "one hundred thirty-seven million, eight hundred ninety-seven thousand, six hundred thirty-one".