137908531 has 4 divisors (see below), whose sum is σ = 139274064. Its totient is φ = 136543000.

The previous prime is 137908523. The next prime is 137908541. The reversal of 137908531 is 135809731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135809731 = 3163 ⋅42937.

It is a cyclic number.

It is not a de Polignac number, because 137908531 - 2³ = 137908523 is a prime.

It is a super-2 number, since 2×137908531² = 38037525845155922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137908501) 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 in 3 ways as a sum of consecutive naturals, for example, 682615 + ... + 682816.

It is an arithmetic number, because the mean of its divisors is an integer number (34818516).

Almost surely, 2^137908531 is an apocalyptic number.

137908531 is a deficient number, since it is larger than the sum of its proper divisors (1365533).

137908531 is a wasteful number, since it uses less digits than its factorization.

137908531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365532.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 137908531 is about 11743.4462999581. The cubic root of 137908531 is about 516.6507261587.

The spelling of 137908531 in words is "one hundred thirty-seven million, nine hundred eight thousand, five hundred thirty-one".