31681671473 has 2 divisors, whose sum is σ = 31681671474. Its totient is φ = 31681671472.

The previous prime is 31681671457. The next prime is 31681671547. The reversal of 31681671473 is 37417618613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31382831104 + 298840369 = 177152^2 + 17287^2 .

It is a cyclic number.

It is not a de Polignac number, because 31681671473 - 2⁴ = 31681671457 is a prime.

It is not a weakly prime, because it can be changed into another prime (31681671403) 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, 15840835736 + 15840835737.

It is an arithmetic number, because the mean of its divisors is an integer number (15840835737).

Almost surely, 2^31681671473 is an apocalyptic number.

It is an amenable number.

31681671473 is a deficient number, since it is larger than the sum of its proper divisors (1).

31681671473 is an equidigital number, since it uses as much as digits as its factorization.

31681671473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The spelling of 31681671473 in words is "thirty-one billion, six hundred eighty-one million, six hundred seventy-one thousand, four hundred seventy-three".