23451557191 has 2 divisors, whose sum is σ = 23451557192. Its totient is φ = 23451557190.

The previous prime is 23451557093. The next prime is 23451557243. The reversal of 23451557191 is 19175515432.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23451557191 - 2²⁹ = 22914686279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23451557791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11725778595 + 11725778596.

It is an arithmetic number, because the mean of its divisors is an integer number (11725778596).

Almost surely, 2^23451557191 is an apocalyptic number.

23451557191 is a deficient number, since it is larger than the sum of its proper divisors (1).

23451557191 is an equidigital number, since it uses as much as digits as its factorization.

23451557191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 189000, while the sum is 43.

The spelling of 23451557191 in words is "twenty-three billion, four hundred fifty-one million, five hundred fifty-seven thousand, one hundred ninety-one".