31007939 has 4 divisors (see below), whose sum is σ = 31252224. Its totient is φ = 30763656.

The previous prime is 31007929. The next prime is 31007941. The reversal of 31007939 is 93970013.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93970013 = 2017 ⋅46589.

It is a cyclic number.

It is not a de Polignac number, because 31007939 - 2⁴ = 31007923 is a prime.

It is a super-2 number, since 2×31007939² = 1922984562055442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31007929) 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, 121952 + ... + 122205.

It is an arithmetic number, because the mean of its divisors is an integer number (7813056).

Almost surely, 2^31007939 is an apocalyptic number.

31007939 is a deficient number, since it is larger than the sum of its proper divisors (244285).

31007939 is a wasteful number, since it uses less digits than its factorization.

31007939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244284.

The product of its (nonzero) digits is 5103, while the sum is 32.

The square root of 31007939 is about 5568.4772604366. The cubic root of 31007939 is about 314.1648795320.

The spelling of 31007939 in words is "thirty-one million, seven thousand, nine hundred thirty-nine".