23191491 has 8 divisors (see below), whose sum is σ = 31641280. Its totient is φ = 15101352.

The previous prime is 23191463. The next prime is 23191507. The reversal of 23191491 is 19419132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23191491 - 2¹⁰ = 23190467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23191391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89761 + ... + 90018.

It is an arithmetic number, because the mean of its divisors is an integer number (3955160).

Almost surely, 2^23191491 is an apocalyptic number.

23191491 is a deficient number, since it is larger than the sum of its proper divisors (8449789).

23191491 is a wasteful number, since it uses less digits than its factorization.

23191491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179825.

The product of its digits is 1944, while the sum is 30.

The square root of 23191491 is about 4815.7544580263. The cubic root of 23191491 is about 285.1737567707.

The spelling of 23191491 in words is "twenty-three million, one hundred ninety-one thousand, four hundred ninety-one".