31071138 has 32 divisors (see below), whose sum is σ = 75199104. Its totient is φ = 8355072.

The previous prime is 31071127. The next prime is 31071149. The reversal of 31071138 is 83117013.

It is an interprime number because it is at equal distance from previous prime (31071127) and next prime (31071149).

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 21045 + ... + 22472.

It is an arithmetic number, because the mean of its divisors is an integer number (2349972).

Almost surely, 2^31071138 is an apocalyptic number.

31071138 is an abundant number, since it is smaller than the sum of its proper divisors (44127966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31071138 is a wasteful number, since it uses less digits than its factorization.

31071138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43546.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 31071138 is about 5574.1490830440. The cubic root of 31071138 is about 314.3781736429.

The spelling of 31071138 in words is "thirty-one million, seventy-one thousand, one hundred thirty-eight".