31368737009 has 2 divisors, whose sum is σ = 31368737010. Its totient is φ = 31368737008.

The previous prime is 31368736877. The next prime is 31368737107. The reversal of 31368737009 is 90073786313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22291983025 + 9076753984 = 149305^2 + 95272^2 .

It is a cyclic number.

It is not a de Polignac number, because 31368737009 - 2²⁰ = 31367688433 is a prime.

It is not a weakly prime, because it can be changed into another prime (31368737809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15684368504 + 15684368505.

It is an arithmetic number, because the mean of its divisors is an integer number (15684368505).

Almost surely, 2^31368737009 is an apocalyptic number.

It is an amenable number.

31368737009 is a deficient number, since it is larger than the sum of its proper divisors (1).

31368737009 is an equidigital number, since it uses as much as digits as its factorization.

31368737009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 47.

The spelling of 31368737009 in words is "thirty-one billion, three hundred sixty-eight million, seven hundred thirty-seven thousand, nine".