31961431979417 has 2 divisors, whose sum is σ = 31961431979418. Its totient is φ = 31961431979416.

The previous prime is 31961431979311. The next prime is 31961431979437. The reversal of 31961431979417 is 71497913416913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31295476423696 + 665955555721 = 5594236^2 + 816061^2 .

It is an emirp because it is prime and its reverse (71497913416913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31961431979417 - 2¹⁰ = 31961431978393 is a prime.

It is not a weakly prime, because it can be changed into another prime (31961431979437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15980715989708 + 15980715989709.

It is an arithmetic number, because the mean of its divisors is an integer number (15980715989709).

Almost surely, 2^{31961431979417} is an apocalyptic number.

It is an amenable number.

31961431979417 is a deficient number, since it is larger than the sum of its proper divisors (1).

31961431979417 is an equidigital number, since it uses as much as digits as its factorization.

31961431979417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30862944, while the sum is 65.

The spelling of 31961431979417 in words is "thirty-one trillion, nine hundred sixty-one billion, four hundred thirty-one million, nine hundred seventy-nine thousand, four hundred seventeen".