23031691 has 4 divisors (see below), whose sum is σ = 23079472. Its totient is φ = 22983912.

The previous prime is 23031683. The next prime is 23031769. The reversal of 23031691 is 19613032.

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 23031691 - 2³ = 23031683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23031601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23160 + ... + 24133.

It is an arithmetic number, because the mean of its divisors is an integer number (5769868).

Almost surely, 2^23031691 is an apocalyptic number.

23031691 is a deficient number, since it is larger than the sum of its proper divisors (47781).

23031691 is an equidigital number, since it uses as much as digits as its factorization.

23031691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47780.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 23031691 is about 4799.1344011186. The cubic root of 23031691 is about 284.5172539658.

The spelling of 23031691 in words is "twenty-three million, thirty-one thousand, six hundred ninety-one".