23661191 has 4 divisors (see below), whose sum is σ = 23737584. Its totient is φ = 23584800.

The previous prime is 23661173. The next prime is 23661199. The reversal of 23661191 is 19116632.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23661191 - 2¹⁰ = 23660167 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 (23661199) 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 3 ways as a sum of consecutive naturals, for example, 37730 + ... + 38351.

It is an arithmetic number, because the mean of its divisors is an integer number (5934396).

Almost surely, 2^23661191 is an apocalyptic number.

23661191 is a deficient number, since it is larger than the sum of its proper divisors (76393).

23661191 is an equidigital number, since it uses as much as digits as its factorization.

23661191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76392.

The product of its digits is 1944, while the sum is 29.

The square root of 23661191 is about 4864.2770274728. The cubic root of 23661191 is about 287.0861230688.

The spelling of 23661191 in words is "twenty-three million, six hundred sixty-one thousand, one hundred ninety-one".