23172191993 has 2 divisors, whose sum is σ = 23172191994. Its totient is φ = 23172191992.

The previous prime is 23172191941. The next prime is 23172192079. The reversal of 23172191993 is 39919127132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20228803984 + 2943388009 = 142228^2 + 54253^2 .

It is a cyclic number.

It is not a de Polignac number, because 23172191993 - 2⁸ = 23172191737 is a prime.

It is not a weakly prime, because it can be changed into another prime (23172191093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11586095996 + 11586095997.

It is an arithmetic number, because the mean of its divisors is an integer number (11586095997).

Almost surely, 2^23172191993 is an apocalyptic number.

It is an amenable number.

23172191993 is a deficient number, since it is larger than the sum of its proper divisors (1).

23172191993 is an equidigital number, since it uses as much as digits as its factorization.

23172191993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 47.

The spelling of 23172191993 in words is "twenty-three billion, one hundred seventy-two million, one hundred ninety-one thousand, nine hundred ninety-three".