31213313112209 has 2 divisors, whose sum is σ = 31213313112210. Its totient is φ = 31213313112208.

The previous prime is 31213313112193. The next prime is 31213313112217. The reversal of 31213313112209 is 90221131331213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18279558211600 + 12933754900609 = 4275460^2 + 3596353^2 .

It is a cyclic number.

It is not a de Polignac number, because 31213313112209 - 2⁴ = 31213313112193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31213313112269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606656556104 + 15606656556105.

It is an arithmetic number, because the mean of its divisors is an integer number (15606656556105).

Almost surely, 2^{31213313112209} is an apocalyptic number.

It is an amenable number.

31213313112209 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213313112209 is an equidigital number, since it uses as much as digits as its factorization.

31213313112209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The spelling of 31213313112209 in words is "thirty-one trillion, two hundred thirteen billion, three hundred thirteen million, one hundred twelve thousand, two hundred nine".