31608288889 has 2 divisors, whose sum is σ = 31608288890. Its totient is φ = 31608288888.

The previous prime is 31608288871. The next prime is 31608288893. The reversal of 31608288889 is 98888280613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18223650025 + 13384638864 = 134995^2 + 115692^2 .

It is a cyclic number.

It is not a de Polignac number, because 31608288889 - 2¹¹ = 31608286841 is a prime.

It is not a weakly prime, because it can be changed into another prime (31608288389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15804144444 + 15804144445.

It is an arithmetic number, because the mean of its divisors is an integer number (15804144445).

Almost surely, 2^31608288889 is an apocalyptic number.

It is an amenable number.

31608288889 is a deficient number, since it is larger than the sum of its proper divisors (1).

31608288889 is an equidigital number, since it uses as much as digits as its factorization.

31608288889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10616832, while the sum is 61.

The spelling of 31608288889 in words is "thirty-one billion, six hundred eight million, two hundred eighty-eight thousand, eight hundred eighty-nine".