231320222993 has 2 divisors, whose sum is σ = 231320222994. Its totient is φ = 231320222992.

The previous prime is 231320222989. The next prime is 231320223007. The reversal of 231320222993 is 399222023132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220502558929 + 10817664064 = 469577^2 + 104008^2 .

It is a cyclic number.

It is not a de Polignac number, because 231320222993 - 2² = 231320222989 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 (231320222923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115660111496 + 115660111497.

It is an arithmetic number, because the mean of its divisors is an integer number (115660111497).

Almost surely, 2^231320222993 is an apocalyptic number.

It is an amenable number.

231320222993 is a deficient number, since it is larger than the sum of its proper divisors (1).

231320222993 is an equidigital number, since it uses as much as digits as its factorization.

231320222993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 38.

The spelling of 231320222993 in words is "two hundred thirty-one billion, three hundred twenty million, two hundred twenty-two thousand, nine hundred ninety-three".