31899630788369 has 4 divisors (see below), whose sum is σ = 31933530503220. Its totient is φ = 31865731073520.

The previous prime is 31899630788359. The next prime is 31899630788387. The reversal of 31899630788369 is 96388703699813.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16784548641025 + 15115082147344 = 4096895^2 + 3887812^2 .

It is a cyclic number.

It is not a de Polignac number, because 31899630788369 - 2⁴⁴ = 14307444743953 is a prime.

It is a super-2 number, since 2×31899630788369² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31899630788293 and 31899630788302.

It is not an unprimeable number, because it can be changed into a prime (31899630788309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16949856014 + ... + 16949857895.

It is an arithmetic number, because the mean of its divisors is an integer number (7983382625805).

Almost surely, 2^{31899630788369} is an apocalyptic number.

It is an amenable number.

31899630788369 is a deficient number, since it is larger than the sum of its proper divisors (33899714851).

31899630788369 is an equidigital number, since it uses as much as digits as its factorization.

31899630788369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33899714850.

The product of its (nonzero) digits is 2539579392, while the sum is 80.

The spelling of 31899630788369 in words is "thirty-one trillion, eight hundred ninety-nine billion, six hundred thirty million, seven hundred eighty-eight thousand, three hundred sixty-nine".