31045139 has 2 divisors, whose sum is σ = 31045140. Its totient is φ = 31045138.

The previous prime is 31045129. The next prime is 31045177. The reversal of 31045139 is 93154013.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31045139 - 2⁸ = 31044883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31045129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15522569 + 15522570.

It is an arithmetic number, because the mean of its divisors is an integer number (15522570).

Almost surely, 2^31045139 is an apocalyptic number.

31045139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31045139 is an equidigital number, since it uses as much as digits as its factorization.

31045139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 31045139 is about 5571.8164901583. The cubic root of 31045139 is about 314.2904631022.

The spelling of 31045139 in words is "thirty-one million, forty-five thousand, one hundred thirty-nine".