31123032139 has 2 divisors, whose sum is σ = 31123032140. Its totient is φ = 31123032138.

The previous prime is 31123032091. The next prime is 31123032151. The reversal of 31123032139 is 93123032113.

It is a strong prime.

It is an emirp because it is prime and its reverse (93123032113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31123032139 - 2²³ = 31114643531 is a prime.

It is a super-3 number, since 3×31123032139³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (31123032169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561516069 + 15561516070.

It is an arithmetic number, because the mean of its divisors is an integer number (15561516070).

Almost surely, 2^31123032139 is an apocalyptic number.

31123032139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123032139 is an equidigital number, since it uses as much as digits as its factorization.

31123032139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 28.

The spelling of 31123032139 in words is "thirty-one billion, one hundred twenty-three million, thirty-two thousand, one hundred thirty-nine".