31958512681 has 2 divisors, whose sum is σ = 31958512682. Its totient is φ = 31958512680.

The previous prime is 31958512637. The next prime is 31958512693. The reversal of 31958512681 is 18621585913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26069331600 + 5889181081 = 161460^2 + 76741^2 .

It is a cyclic number.

It is not a de Polignac number, because 31958512681 - 2¹³ = 31958504489 is a prime.

It is a super-2 number, since 2×31958512681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31958512631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15979256340 + 15979256341.

It is an arithmetic number, because the mean of its divisors is an integer number (15979256341).

Almost surely, 2^31958512681 is an apocalyptic number.

It is an amenable number.

31958512681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31958512681 is an equidigital number, since it uses as much as digits as its factorization.

31958512681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 49.

The spelling of 31958512681 in words is "thirty-one billion, nine hundred fifty-eight million, five hundred twelve thousand, six hundred eighty-one".