31331753393 has 2 divisors, whose sum is σ = 31331753394. Its totient is φ = 31331753392.

The previous prime is 31331753377. The next prime is 31331753429. The reversal of 31331753393 is 39335713313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28167915889 + 3163837504 = 167833^2 + 56248^2 .

It is a cyclic number.

It is not a de Polignac number, because 31331753393 - 2⁴ = 31331753377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31331753393.

It is not a weakly prime, because it can be changed into another prime (31331753693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15665876696 + 15665876697.

It is an arithmetic number, because the mean of its divisors is an integer number (15665876697).

Almost surely, 2^31331753393 is an apocalyptic number.

It is an amenable number.

31331753393 is a deficient number, since it is larger than the sum of its proper divisors (1).

31331753393 is an equidigital number, since it uses as much as digits as its factorization.

31331753393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 229635, while the sum is 41.

The spelling of 31331753393 in words is "thirty-one billion, three hundred thirty-one million, seven hundred fifty-three thousand, three hundred ninety-three".