31637963249 has 2 divisors, whose sum is σ = 31637963250. Its totient is φ = 31637963248.

The previous prime is 31637963243. The next prime is 31637963263. The reversal of 31637963249 is 94236973613.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31092974224 + 544989025 = 176332^2 + 23345^2 .

It is a cyclic number.

It is not a de Polignac number, because 31637963249 - 2⁴ = 31637963233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31637963249.

It is not a weakly prime, because it can be changed into another prime (31637963243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15818981624 + 15818981625.

It is an arithmetic number, because the mean of its divisors is an integer number (15818981625).

Almost surely, 2^31637963249 is an apocalyptic number.

It is an amenable number.

31637963249 is a deficient number, since it is larger than the sum of its proper divisors (1).

31637963249 is an equidigital number, since it uses as much as digits as its factorization.

31637963249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 53.

The spelling of 31637963249 in words is "thirty-one billion, six hundred thirty-seven million, nine hundred sixty-three thousand, two hundred forty-nine".