31551010009 has 2 divisors, whose sum is σ = 31551010010. Its totient is φ = 31551010008.

The previous prime is 31551009977. The next prime is 31551010013. The reversal of 31551010009 is 90001015513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17827590400 + 13723419609 = 133520^2 + 117147^2 .

It is a cyclic number.

It is not a de Polignac number, because 31551010009 - 2⁵ = 31551009977 is a prime.

It is not a weakly prime, because it can be changed into another prime (31551010079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15775505004 + 15775505005.

It is an arithmetic number, because the mean of its divisors is an integer number (15775505005).

Almost surely, 2^31551010009 is an apocalyptic number.

It is an amenable number.

31551010009 is a deficient number, since it is larger than the sum of its proper divisors (1).

31551010009 is an equidigital number, since it uses as much as digits as its factorization.

31551010009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 675, while the sum is 25.

The spelling of 31551010009 in words is "thirty-one billion, five hundred fifty-one million, ten thousand, nine".