31944851717 has 2 divisors, whose sum is σ = 31944851718. Its totient is φ = 31944851716.

The previous prime is 31944851663. The next prime is 31944851749. The reversal of 31944851717 is 71715844913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18948623716 + 12996228001 = 137654^2 + 114001^2 .

It is an emirp because it is prime and its reverse (71715844913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31944851717 - 2¹² = 31944847621 is a prime.

It is a super-2 number, since 2×31944851717² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31944851417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15972425858 + 15972425859.

It is an arithmetic number, because the mean of its divisors is an integer number (15972425859).

Almost surely, 2^31944851717 is an apocalyptic number.

It is an amenable number.

31944851717 is a deficient number, since it is larger than the sum of its proper divisors (1).

31944851717 is an equidigital number, since it uses as much as digits as its factorization.

31944851717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 50.

The spelling of 31944851717 in words is "thirty-one billion, nine hundred forty-four million, eight hundred fifty-one thousand, seven hundred seventeen".