31323316109 has 2 divisors, whose sum is σ = 31323316110. Its totient is φ = 31323316108.

The previous prime is 31323316097. The next prime is 31323316111. The reversal of 31323316109 is 90161332313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17576926084 + 13746390025 = 132578^2 + 117245^2 .

It is a cyclic number.

It is not a de Polignac number, because 31323316109 - 2²⁸ = 31054880653 is a prime.

It is a Sophie Germain prime.

Together with 31323316111, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31323316169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661658054 + 15661658055.

It is an arithmetic number, because the mean of its divisors is an integer number (15661658055).

Almost surely, 2^31323316109 is an apocalyptic number.

It is an amenable number.

31323316109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323316109 is an equidigital number, since it uses as much as digits as its factorization.

31323316109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 32.

The spelling of 31323316109 in words is "thirty-one billion, three hundred twenty-three million, three hundred sixteen thousand, one hundred nine".