23191857 has 12 divisors (see below), whose sum is σ = 36076404. Its totient is φ = 14271840.

The previous prime is 23191853. The next prime is 23191867. The reversal of 23191857 is 75819132.

It can be written as a sum of positive squares in 2 ways, for example, as 15374241 + 7817616 = 3921^2 + 2796^2 .

It is not a de Polignac number, because 23191857 - 2² = 23191853 is a prime.

It is a super-2 number, since 2×23191857² = 1075724462216898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23191853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98994 + ... + 99227.

It is an arithmetic number, because the mean of its divisors is an integer number (3006367).

Almost surely, 2^23191857 is an apocalyptic number.

It is an amenable number.

23191857 is a deficient number, since it is larger than the sum of its proper divisors (12884547).

23191857 is a wasteful number, since it uses less digits than its factorization.

23191857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198240 (or 198237 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 23191857 is about 4815.7924581527. The cubic root of 23191857 is about 285.1752569336.

The spelling of 23191857 in words is "twenty-three million, one hundred ninety-one thousand, eight hundred fifty-seven".