31557650609 has 2 divisors, whose sum is σ = 31557650610. Its totient is φ = 31557650608.

The previous prime is 31557650567. The next prime is 31557650627. The reversal of 31557650609 is 90605675513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28816081009 + 2741569600 = 169753^2 + 52360^2 .

It is a cyclic number.

It is not a de Polignac number, because 31557650609 - 2¹² = 31557646513 is a prime.

It is not a weakly prime, because it can be changed into another prime (31557650629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15778825304 + 15778825305.

It is an arithmetic number, because the mean of its divisors is an integer number (15778825305).

Almost surely, 2^31557650609 is an apocalyptic number.

It is an amenable number.

31557650609 is a deficient number, since it is larger than the sum of its proper divisors (1).

31557650609 is an equidigital number, since it uses as much as digits as its factorization.

31557650609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 850500, while the sum is 47.

The spelling of 31557650609 in words is "thirty-one billion, five hundred fifty-seven million, six hundred fifty thousand, six hundred nine".