31152138 has 8 divisors (see below), whose sum is σ = 62304288. Its totient is φ = 10384044.

The previous prime is 31152133. The next prime is 31152161. The reversal of 31152138 is 83125113.

It is a sphenic number, since it is the product of 3 distinct primes.

31152138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (31152133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2596006 + ... + 2596017.

It is an arithmetic number, because the mean of its divisors is an integer number (7788036).

Almost surely, 2^31152138 is an apocalyptic number.

31152138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31152138 is a wasteful number, since it uses less digits than its factorization.

31152138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5192028.

The product of its digits is 720, while the sum is 24.

The square root of 31152138 is about 5581.4100368993. The cubic root of 31152138 is about 314.6511229415.

It can be divided in two parts, 3115 and 2138, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 31152138 in words is "thirty-one million, one hundred fifty-two thousand, one hundred thirty-eight".