31123203193 has 2 divisors, whose sum is σ = 31123203194. Its totient is φ = 31123203192.

The previous prime is 31123203157. The next prime is 31123203217. The reversal of 31123203193 is 39130232113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28403372089 + 2719831104 = 168533^2 + 52152^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123203193 - 2²⁵ = 31089648761 is a prime.

It is not a weakly prime, because it can be changed into another prime (31123206193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561601596 + 15561601597.

It is an arithmetic number, because the mean of its divisors is an integer number (15561601597).

Almost surely, 2^31123203193 is an apocalyptic number.

It is an amenable number.

31123203193 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123203193 is an equidigital number, since it uses as much as digits as its factorization.

31123203193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 28.

The spelling of 31123203193 in words is "thirty-one billion, one hundred twenty-three million, two hundred three thousand, one hundred ninety-three".