31123201139 has 2 divisors, whose sum is σ = 31123201140. Its totient is φ = 31123201138.

The previous prime is 31123201117. The next prime is 31123201171. The reversal of 31123201139 is 93110232113.

It is a weak prime.

It is an emirp because it is prime and its reverse (93110232113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31123201139 - 2⁸ = 31123200883 is a prime.

It is not a weakly prime, because it can be changed into another prime (31123291139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561600569 + 15561600570.

It is an arithmetic number, because the mean of its divisors is an integer number (15561600570).

Almost surely, 2^31123201139 is an apocalyptic number.

31123201139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123201139 is an equidigital number, since it uses as much as digits as its factorization.

31123201139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 31123201139 in words is "thirty-one billion, one hundred twenty-three million, two hundred one thousand, one hundred thirty-nine".