31080639 has 8 divisors (see below), whose sum is σ = 41468032. Its totient is φ = 20706840.

The previous prime is 31080619. The next prime is 31080671. The reversal of 31080639 is 93608013.

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

It is a de Polignac number, because none of the positive numbers 2^k-31080639 is a prime.

It is a super-2 number, since 2×31080639² = 1932012241296642, 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 (31080619) 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, 4692 + ... + 9174.

It is an arithmetic number, because the mean of its divisors is an integer number (5183504).

Almost surely, 2^31080639 is an apocalyptic number.

31080639 is a deficient number, since it is larger than the sum of its proper divisors (10387393).

31080639 is a wasteful number, since it uses less digits than its factorization.

31080639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6797.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 31080639 is about 5575.0012556052. The cubic root of 31080639 is about 314.4102141241.

The spelling of 31080639 in words is "thirty-one million, eighty thousand, six hundred thirty-nine".