31867732681 has 2 divisors, whose sum is σ = 31867732682. Its totient is φ = 31867732680.

The previous prime is 31867732679. The next prime is 31867732697. The reversal of 31867732681 is 18623776813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24832717056 + 7035015625 = 157584^2 + 83875^2 .

It is a cyclic number.

It is not a de Polignac number, because 31867732681 - 2¹ = 31867732679 is a prime.

It is a super-2 number, since 2×31867732681² (a number of 22 digits) contains 22 as substring.

Together with 31867732679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31867732661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15933866340 + 15933866341.

It is an arithmetic number, because the mean of its divisors is an integer number (15933866341).

Almost surely, 2^31867732681 is an apocalyptic number.

It is an amenable number.

31867732681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31867732681 is an equidigital number, since it uses as much as digits as its factorization.

31867732681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 52.

The spelling of 31867732681 in words is "thirty-one billion, eight hundred sixty-seven million, seven hundred thirty-two thousand, six hundred eighty-one".