31313312209 has 4 divisors (see below), whose sum is σ = 32041528816. Its totient is φ = 30585095604.

The previous prime is 31313312201. The next prime is 31313312221. The reversal of 31313312209 is 90221331313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31313312209 - 2³ = 31313312201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31313312201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364108239 + ... + 364108324.

It is an arithmetic number, because the mean of its divisors is an integer number (8010382204).

Almost surely, 2^31313312209 is an apocalyptic number.

It is an amenable number.

31313312209 is a deficient number, since it is larger than the sum of its proper divisors (728216607).

31313312209 is an equidigital number, since it uses as much as digits as its factorization.

31313312209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728216606.

The product of its (nonzero) digits is 2916, while the sum is 28.

The spelling of 31313312209 in words is "thirty-one billion, three hundred thirteen million, three hundred twelve thousand, two hundred nine".