137897531 has 2 divisors, whose sum is σ = 137897532. Its totient is φ = 137897530.

The previous prime is 137897527. The next prime is 137897561. The reversal of 137897531 is 135798731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 137897531 - 2² = 137897527 is a prime.

It is a super-2 number, since 2×137897531² = 38031458111791922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (137897521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68948765 + 68948766.

It is an arithmetic number, because the mean of its divisors is an integer number (68948766).

Almost surely, 2^137897531 is an apocalyptic number.

137897531 is a deficient number, since it is larger than the sum of its proper divisors (1).

137897531 is an equidigital number, since it uses as much as digits as its factorization.

137897531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 44.

The square root of 137897531 is about 11742.9779442865. The cubic root of 137897531 is about 516.6369892538.

The spelling of 137897531 in words is "one hundred thirty-seven million, eight hundred ninety-seven thousand, five hundred thirty-one".