137905931 has 4 divisors (see below), whose sum is σ = 138898200. Its totient is φ = 136913664.

The previous prime is 137905903. The next prime is 137905961. The reversal of 137905931 is 139509731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 137905931 - 2¹⁴ = 137889547 is a prime.

It is a super-2 number, since 2×137905931² = 38036091609953522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137905961) 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, 495926 + ... + 496203.

It is an arithmetic number, because the mean of its divisors is an integer number (34724550).

Almost surely, 2^137905931 is an apocalyptic number.

137905931 is a deficient number, since it is larger than the sum of its proper divisors (992269).

137905931 is an equidigital number, since it uses as much as digits as its factorization.

137905931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992268.

The product of its (nonzero) digits is 25515, while the sum is 38.

The square root of 137905931 is about 11743.3355993942. The cubic root of 137905931 is about 516.6474793198.

The spelling of 137905931 in words is "one hundred thirty-seven million, nine hundred five thousand, nine hundred thirty-one".