138095831 has 12 divisors (see below), whose sum is σ = 142995216. Its totient is φ = 133351680.

The previous prime is 138095821. The next prime is 138095927. The reversal of 138095831 is 138590831.

It is a de Polignac number, because none of the positive numbers 2^k-138095831 is a prime.

It is a super-2 number, since 2×138095831² = 38140917079161122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138095801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189590 + ... + 190316.

It is an arithmetic number, because the mean of its divisors is an integer number (11916268).

Almost surely, 2^138095831 is an apocalyptic number.

138095831 is a deficient number, since it is larger than the sum of its proper divisors (4899385).

138095831 is an equidigital number, since it uses as much as digits as its factorization.

138095831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922 (or 881 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 138095831 is about 11751.4182548321. The cubic root of 138095831 is about 516.8845161562.

The spelling of 138095831 in words is "one hundred thirty-eight million, ninety-five thousand, eight hundred thirty-one".