31753023631981 has 2 divisors, whose sum is σ = 31753023631982. Its totient is φ = 31753023631980.

The previous prime is 31753023631913. The next prime is 31753023632009. The reversal of 31753023631981 is 18913632035713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30380766015625 + 1372257616356 = 5511875^2 + 1171434^2 .

It is a cyclic number.

It is not a de Polignac number, because 31753023631981 - 2³⁵ = 31718663893613 is a prime.

It is a super-2 number, since 2×31753023631981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1753023631981) 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, 15876511815990 + 15876511815991.

It is an arithmetic number, because the mean of its divisors is an integer number (15876511815991).

Almost surely, 2^{31753023631981} is an apocalyptic number.

It is an amenable number.

31753023631981 is a deficient number, since it is larger than the sum of its proper divisors (1).

31753023631981 is an equidigital number, since it uses as much as digits as its factorization.

31753023631981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 31753023631981 in words is "thirty-one trillion, seven hundred fifty-three billion, twenty-three million, six hundred thirty-one thousand, nine hundred eighty-one".