31120039 has 2 divisors, whose sum is σ = 31120040. Its totient is φ = 31120038.

The previous prime is 31120031. The next prime is 31120049. The reversal of 31120039 is 93002113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31120039 - 2³ = 31120031 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31119998 and 31120025.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31120031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560019 + 15560020.

It is an arithmetic number, because the mean of its divisors is an integer number (15560020).

Almost surely, 2^31120039 is an apocalyptic number.

31120039 is a deficient number, since it is larger than the sum of its proper divisors (1).

31120039 is an equidigital number, since it uses as much as digits as its factorization.

31120039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 31120039 is about 5578.5337679358. The cubic root of 31120039 is about 314.5430141778.

The spelling of 31120039 in words is "thirty-one million, one hundred twenty thousand, thirty-nine".