31649372009 has 2 divisors, whose sum is σ = 31649372010. Its totient is φ = 31649372008.

The previous prime is 31649371991. The next prime is 31649372017. The reversal of 31649372009 is 90027394613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25527091984 + 6122280025 = 159772^2 + 78245^2 .

It is a cyclic number.

It is not a de Polignac number, because 31649372009 - 2⁸ = 31649371753 is a prime.

It is not a weakly prime, because it can be changed into another prime (31649372509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15824686004 + 15824686005.

It is an arithmetic number, because the mean of its divisors is an integer number (15824686005).

Almost surely, 2^31649372009 is an apocalyptic number.

It is an amenable number.

31649372009 is a deficient number, since it is larger than the sum of its proper divisors (1).

31649372009 is an equidigital number, since it uses as much as digits as its factorization.

31649372009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 44.

The spelling of 31649372009 in words is "thirty-one billion, six hundred forty-nine million, three hundred seventy-two thousand, nine".