31024139 has 2 divisors, whose sum is σ = 31024140. Its totient is φ = 31024138.

The previous prime is 31024129. The next prime is 31024141. The reversal of 31024139 is 93142013.

It is a strong prime.

It is an emirp because it is prime and its reverse (93142013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31024139 - 2²⁴ = 14246923 is a prime.

It is a Sophie Germain prime.

Together with 31024141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31024109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15512069 + 15512070.

It is an arithmetic number, because the mean of its divisors is an integer number (15512070).

Almost surely, 2^31024139 is an apocalyptic number.

31024139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31024139 is an equidigital number, since it uses as much as digits as its factorization.

31024139 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 31024139 is about 5569.9316871933. The cubic root of 31024139 is about 314.2195814905.

The spelling of 31024139 in words is "thirty-one million, twenty-four thousand, one hundred thirty-nine".