31564441313 has 2 divisors, whose sum is σ = 31564441314. Its totient is φ = 31564441312.

The previous prime is 31564441309. The next prime is 31564441327. The reversal of 31564441313 is 31314446513.

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., 23187066529 + 8377374784 = 152273^2 + 91528^2 .

It is a cyclic number.

It is not a de Polignac number, because 31564441313 - 2² = 31564441309 is a prime.

It is not a weakly prime, because it can be changed into another prime (31564441303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15782220656 + 15782220657.

It is an arithmetic number, because the mean of its divisors is an integer number (15782220657).

Almost surely, 2^31564441313 is an apocalyptic number.

It is an amenable number.

31564441313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31564441313 is an equidigital number, since it uses as much as digits as its factorization.

31564441313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 35.

Adding to 31564441313 its reverse (31314446513), we get a palindrome (62878887826).

The spelling of 31564441313 in words is "thirty-one billion, five hundred sixty-four million, four hundred forty-one thousand, three hundred thirteen".