31285315129 has 2 divisors, whose sum is σ = 31285315130. Its totient is φ = 31285315128.

The previous prime is 31285315123. The next prime is 31285315177. The reversal of 31285315129 is 92151358213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24382197904 + 6903117225 = 156148^2 + 83085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31285315129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31285315091 and 31285315100.

It is not a weakly prime, because it can be changed into another prime (31285315123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15642657564 + 15642657565.

It is an arithmetic number, because the mean of its divisors is an integer number (15642657565).

Almost surely, 2^31285315129 is an apocalyptic number.

It is an amenable number.

31285315129 is a deficient number, since it is larger than the sum of its proper divisors (1).

31285315129 is an equidigital number, since it uses as much as digits as its factorization.

31285315129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 40.

The spelling of 31285315129 in words is "thirty-one billion, two hundred eighty-five million, three hundred fifteen thousand, one hundred twenty-nine".