31583272681 has 2 divisors, whose sum is σ = 31583272682. Its totient is φ = 31583272680.

The previous prime is 31583272663. The next prime is 31583272691. The reversal of 31583272681 is 18627238513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25053824656 + 6529448025 = 158284^2 + 80805^2 .

It is a cyclic number.

It is not a de Polignac number, because 31583272681 - 2⁵ = 31583272649 is a prime.

It is a super-2 number, since 2×31583272681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31583272601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15791636340 + 15791636341.

It is an arithmetic number, because the mean of its divisors is an integer number (15791636341).

Almost surely, 2^31583272681 is an apocalyptic number.

It is an amenable number.

31583272681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31583272681 is an equidigital number, since it uses as much as digits as its factorization.

31583272681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 46.

The spelling of 31583272681 in words is "thirty-one billion, five hundred eighty-three million, two hundred seventy-two thousand, six hundred eighty-one".