31997880516359 has 2 divisors, whose sum is σ = 31997880516360. Its totient is φ = 31997880516358.

The previous prime is 31997880516347. The next prime is 31997880516389. The reversal of 31997880516359 is 95361508879913.

It is a weak prime.

It is an emirp because it is prime and its reverse (95361508879913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31997880516359 - 2⁴⁴ = 14405694471943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31997880516319) 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, 15998940258179 + 15998940258180.

It is an arithmetic number, because the mean of its divisors is an integer number (15998940258180).

Almost surely, 2^{31997880516359} is an apocalyptic number.

31997880516359 is a deficient number, since it is larger than the sum of its proper divisors (1).

31997880516359 is an equidigital number, since it uses as much as digits as its factorization.

31997880516359 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 440899200, while the sum is 74.

The spelling of 31997880516359 in words is "thirty-one trillion, nine hundred ninety-seven billion, eight hundred eighty million, five hundred sixteen thousand, three hundred fifty-nine".