31108289393 has 2 divisors, whose sum is σ = 31108289394. Its totient is φ = 31108289392.

The previous prime is 31108289371. The next prime is 31108289411. The reversal of 31108289393 is 39398280113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24953573089 + 6154716304 = 157967^2 + 78452^2 .

It is a cyclic number.

It is not a de Polignac number, because 31108289393 - 2²⁰ = 31107240817 is a prime.

It is not a weakly prime, because it can be changed into another prime (31108289323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15554144696 + 15554144697.

It is an arithmetic number, because the mean of its divisors is an integer number (15554144697).

Almost surely, 2^31108289393 is an apocalyptic number.

It is an amenable number.

31108289393 is a deficient number, since it is larger than the sum of its proper divisors (1).

31108289393 is an equidigital number, since it uses as much as digits as its factorization.

31108289393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 31108289393 in words is "thirty-one billion, one hundred eight million, two hundred eighty-nine thousand, three hundred ninety-three".