31123231193 has 2 divisors, whose sum is σ = 31123231194. Its totient is φ = 31123231192.

The previous prime is 31123231189. The next prime is 31123231229. The reversal of 31123231193 is 39113232113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19960886089 + 11162345104 = 141283^2 + 105652^2 .

It is an emirp because it is prime and its reverse (39113232113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31123231193 - 2² = 31123231189 is a prime.

It is not a weakly prime, because it can be changed into another prime (31123231123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561615596 + 15561615597.

It is an arithmetic number, because the mean of its divisors is an integer number (15561615597).

Almost surely, 2^31123231193 is an apocalyptic number.

It is an amenable number.

31123231193 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123231193 is an equidigital number, since it uses as much as digits as its factorization.

31123231193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 29.

The spelling of 31123231193 in words is "thirty-one billion, one hundred twenty-three million, two hundred thirty-one thousand, one hundred ninety-three".