31644880009 has 2 divisors, whose sum is σ = 31644880010. Its totient is φ = 31644880008.

The previous prime is 31644879983. The next prime is 31644880031. The reversal of 31644880009 is 90008844613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28266015625 + 3378864384 = 168125^2 + 58128^2 .

It is a cyclic number.

It is not a de Polignac number, because 31644880009 - 2³¹ = 29497396361 is a prime.

It is not a weakly prime, because it can be changed into another prime (31644880039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15822440004 + 15822440005.

It is an arithmetic number, because the mean of its divisors is an integer number (15822440005).

Almost surely, 2^31644880009 is an apocalyptic number.

It is an amenable number.

31644880009 is a deficient number, since it is larger than the sum of its proper divisors (1).

31644880009 is an equidigital number, since it uses as much as digits as its factorization.

31644880009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 31644880009 in words is "thirty-one billion, six hundred forty-four million, eight hundred eighty thousand, nine".