31793811309 has 90 divisors (see below), whose sum is σ = 53390980170. Its totient is φ = 18824000832.

The previous prime is 31793811307. The next prime is 31793811319. The reversal of 31793811309 is 90311839713.

It can be written as a sum of positive squares in 3 ways, for example, as 6487209 + 31787324100 = 2547^2 + 178290^2 .

It is not a de Polignac number, because 31793811309 - 2¹ = 31793811307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31793811307) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 112345482 + ... + 112345764.

It is an arithmetic number, because the mean of its divisors is an integer number (593233113).

Almost surely, 2^31793811309 is an apocalyptic number.

31793811309 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

31793811309 is a deficient number, since it is larger than the sum of its proper divisors (21597168861).

31793811309 is an equidigital number, since it uses as much as digits as its factorization.

31793811309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 31793811309 in words is "thirty-one billion, seven hundred ninety-three million, eight hundred eleven thousand, three hundred nine".