137831731 has 2 divisors, whose sum is σ = 137831732. Its totient is φ = 137831730.

The previous prime is 137831723. The next prime is 137831783. The reversal of 137831731 is 137138731.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 137831731 - 2³ = 137831723 is a prime.

It is a super-2 number, since 2×137831731² = 37995172140912722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (137831131) 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 as a sum of consecutive naturals, namely, 68915865 + 68915866.

It is an arithmetic number, because the mean of its divisors is an integer number (68915866).

Almost surely, 2^137831731 is an apocalyptic number.

137831731 is a deficient number, since it is larger than the sum of its proper divisors (1).

137831731 is an equidigital number, since it uses as much as digits as its factorization.

137831731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 34.

The square root of 137831731 is about 11740.1759356493. The cubic root of 137831731 is about 516.5548023282.

The spelling of 137831731 in words is "one hundred thirty-seven million, eight hundred thirty-one thousand, seven hundred thirty-one".