18231423193 has 2 divisors, whose sum is σ = 18231423194. Its totient is φ = 18231423192.

The previous prime is 18231423157. The next prime is 18231423283. The reversal of 18231423193 is 39132413281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17841479184 + 389944009 = 133572^2 + 19747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18231423193 is a prime.

It is not a weakly prime, because it can be changed into another prime (18231423143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9115711596 + 9115711597.

It is an arithmetic number, because the mean of its divisors is an integer number (9115711597).

Almost surely, 2^18231423193 is an apocalyptic number.

It is an amenable number.

18231423193 is a deficient number, since it is larger than the sum of its proper divisors (1).

18231423193 is an equidigital number, since it uses as much as digits as its factorization.

18231423193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The spelling of 18231423193 in words is "eighteen billion, two hundred thirty-one million, four hundred twenty-three thousand, one hundred ninety-three".