31443126317 has 2 divisors, whose sum is σ = 31443126318. Its totient is φ = 31443126316.

The previous prime is 31443126311. The next prime is 31443126397. The reversal of 31443126317 is 71362134413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26053510921 + 5389615396 = 161411^2 + 73414^2 .

It is a cyclic number.

It is not a de Polignac number, because 31443126317 - 2³² = 27148159021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31443126311) 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, 15721563158 + 15721563159.

It is an arithmetic number, because the mean of its divisors is an integer number (15721563159).

Almost surely, 2^31443126317 is an apocalyptic number.

It is an amenable number.

31443126317 is a deficient number, since it is larger than the sum of its proper divisors (1).

31443126317 is an equidigital number, since it uses as much as digits as its factorization.

31443126317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 35.

The spelling of 31443126317 in words is "thirty-one billion, four hundred forty-three million, one hundred twenty-six thousand, three hundred seventeen".