23191909 has 16 divisors (see below), whose sum is σ = 26046720. Its totient is φ = 20502720.

The previous prime is 23191907. The next prime is 23191957. The reversal of 23191909 is 90919132.

It is a cyclic number.

It is not a de Polignac number, because 23191909 - 2¹ = 23191907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23191907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85444 + ... + 85714.

It is an arithmetic number, because the mean of its divisors is an integer number (1627920).

Almost surely, 2^23191909 is an apocalyptic number.

23191909 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

23191909 is a deficient number, since it is larger than the sum of its proper divisors (2854811).

23191909 is a wasteful number, since it uses less digits than its factorization.

23191909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 23191909 is about 4815.7978570534. The cubic root of 23191909 is about 285.1754700702.

The spelling of 23191909 in words is "twenty-three million, one hundred ninety-one thousand, nine hundred nine".