31310138 has 16 divisors (see below), whose sum is σ = 50118720. Its totient is φ = 14626656.

The previous prime is 31310137. The next prime is 31310161. The reversal of 31310138 is 83101313.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31310137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2870 + ... + 8417.

It is an arithmetic number, because the mean of its divisors is an integer number (3132420).

Almost surely, 2^31310138 is an apocalyptic number.

31310138 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

31310138 is a deficient number, since it is larger than the sum of its proper divisors (18808582).

31310138 is a wasteful number, since it uses less digits than its factorization.

31310138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11381.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 31310138 is about 5595.5462646644. The cubic root of 31310138 is about 315.1821840210.

The spelling of 31310138 in words is "thirty-one million, three hundred ten thousand, one hundred thirty-eight".