31142039 has 2 divisors, whose sum is σ = 31142040. Its totient is φ = 31142038.

The previous prime is 31142021. The next prime is 31142077. The reversal of 31142039 is 93024113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31142039 - 2¹² = 31137943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31142099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571019 + 15571020.

It is an arithmetic number, because the mean of its divisors is an integer number (15571020).

Almost surely, 2^31142039 is an apocalyptic number.

31142039 is a deficient number, since it is larger than the sum of its proper divisors (1).

31142039 is an equidigital number, since it uses as much as digits as its factorization.

31142039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 31142039 is about 5580.5052638628. The cubic root of 31142039 is about 314.6171177299.

The spelling of 31142039 in words is "thirty-one million, one hundred forty-two thousand, thirty-nine".