31312890029 has 2 divisors, whose sum is σ = 31312890030. Its totient is φ = 31312890028.

The previous prime is 31312890013. The next prime is 31312890047. The reversal of 31312890029 is 92009821313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28198133929 + 3114756100 = 167923^2 + 55810^2 .

It is a cyclic number.

It is not a de Polignac number, because 31312890029 - 2⁴ = 31312890013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31312889974 and 31312890001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31312890079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656445014 + 15656445015.

It is an arithmetic number, because the mean of its divisors is an integer number (15656445015).

Almost surely, 2^31312890029 is an apocalyptic number.

It is an amenable number.

31312890029 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312890029 is an equidigital number, since it uses as much as digits as its factorization.

31312890029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 31312890029 in words is "thirty-one billion, three hundred twelve million, eight hundred ninety thousand, twenty-nine".