31012039 has 2 divisors, whose sum is σ = 31012040. Its totient is φ = 31012038.

The previous prime is 31012021. The next prime is 31012043. The reversal of 31012039 is 93021013.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31012039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31012099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506019 + 15506020.

It is an arithmetic number, because the mean of its divisors is an integer number (15506020).

Almost surely, 2^31012039 is an apocalyptic number.

31012039 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012039 is an equidigital number, since it uses as much as digits as its factorization.

31012039 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 31012039 is about 5568.8453920000. The cubic root of 31012039 is about 314.1787256553.

The spelling of 31012039 in words is "thirty-one million, twelve thousand, thirty-nine".