31718474477 has 2 divisors, whose sum is σ = 31718474478. Its totient is φ = 31718474476.

The previous prime is 31718474453. The next prime is 31718474503. The reversal of 31718474477 is 77447481713.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30746219716 + 972254761 = 175346^2 + 31181^2 .

It is a cyclic number.

It is not a de Polignac number, because 31718474477 - 2¹⁶ = 31718408941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31718474077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15859237238 + 15859237239.

It is an arithmetic number, because the mean of its divisors is an integer number (15859237239).

Almost surely, 2^31718474477 is an apocalyptic number.

It is an amenable number.

31718474477 is a deficient number, since it is larger than the sum of its proper divisors (1).

31718474477 is an equidigital number, since it uses as much as digits as its factorization.

31718474477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3687936, while the sum is 53.

The spelling of 31718474477 in words is "thirty-one billion, seven hundred eighteen million, four hundred seventy-four thousand, four hundred seventy-seven".