31020039 has 6 divisors (see below), whose sum is σ = 44806736. Its totient is φ = 20680020.

The previous prime is 31020007. The next prime is 31020079. The reversal of 31020039 is 93002013.

It is not a de Polignac number, because 31020039 - 2⁵ = 31020007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020079) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1723327 + ... + 1723344.

Almost surely, 2^31020039 is an apocalyptic number.

31020039 is a deficient number, since it is larger than the sum of its proper divisors (13786697).

31020039 is a wasteful number, since it uses less digits than its factorization.

31020039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3446677 (or 3446674 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 31020039 is about 5569.5636274308. The cubic root of 31020039 is about 314.2057389679.

The spelling of 31020039 in words is "thirty-one million, twenty thousand, thirty-nine".