31316139 has 12 divisors (see below), whose sum is σ = 46910136. Its totient is φ = 20877264.

The previous prime is 31316111. The next prime is 31316141. The reversal of 31316139 is 93161313.

It is not a de Polignac number, because 31316139 - 2⁸ = 31315883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31316039) 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, 64194 + ... + 64679.

It is an arithmetic number, because the mean of its divisors is an integer number (3909178).

Almost surely, 2^31316139 is an apocalyptic number.

31316139 is a deficient number, since it is larger than the sum of its proper divisors (15593997).

31316139 is an equidigital number, since it uses as much as digits as its factorization.

31316139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128888 (or 128876 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 31316139 is about 5596.0824690135. The cubic root of 31316139 is about 315.2023190058.

The spelling of 31316139 in words is "thirty-one million, three hundred sixteen thousand, one hundred thirty-nine".