31988093393 has 2 divisors, whose sum is σ = 31988093394. Its totient is φ = 31988093392.

The previous prime is 31988093327. The next prime is 31988093399. The reversal of 31988093393 is 39339088913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30552592849 + 1435500544 = 174793^2 + 37888^2 .

It is an emirp because it is prime and its reverse (39339088913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31988093393 - 2²⁴ = 31971316177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31988093399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15994046696 + 15994046697.

It is an arithmetic number, because the mean of its divisors is an integer number (15994046697).

Almost surely, 2^31988093393 is an apocalyptic number.

It is an amenable number.

31988093393 is a deficient number, since it is larger than the sum of its proper divisors (1).

31988093393 is an equidigital number, since it uses as much as digits as its factorization.

31988093393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3779136, while the sum is 56.

The spelling of 31988093393 in words is "thirty-one billion, nine hundred eighty-eight million, ninety-three thousand, three hundred ninety-three".