31020423139 has 2 divisors, whose sum is σ = 31020423140. Its totient is φ = 31020423138.

The previous prime is 31020423121. The next prime is 31020423143. The reversal of 31020423139 is 93132402013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31020423139 - 2¹⁵ = 31020390371 is a prime.

It is a super-2 number, since 2×31020423139² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31020423839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510211569 + 15510211570.

It is an arithmetic number, because the mean of its divisors is an integer number (15510211570).

Almost surely, 2^31020423139 is an apocalyptic number.

31020423139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020423139 is an equidigital number, since it uses as much as digits as its factorization.

31020423139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 31020423139 in words is "thirty-one billion, twenty million, four hundred twenty-three thousand, one hundred thirty-nine".