31144307321 has 2 divisors, whose sum is σ = 31144307322. Its totient is φ = 31144307320.

The previous prime is 31144307297. The next prime is 31144307329. The reversal of 31144307321 is 12370344113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23668284025 + 7476023296 = 153845^2 + 86464^2 .

It is a cyclic number.

It is not a de Polignac number, because 31144307321 - 2¹⁴ = 31144290937 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 (31144307329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15572153660 + 15572153661.

It is an arithmetic number, because the mean of its divisors is an integer number (15572153661).

Almost surely, 2^31144307321 is an apocalyptic number.

It is an amenable number.

31144307321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31144307321 is an equidigital number, since it uses as much as digits as its factorization.

31144307321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The spelling of 31144307321 in words is "thirty-one billion, one hundred forty-four million, three hundred seven thousand, three hundred twenty-one".