23691 has 8 divisors (see below), whose sum is σ = 32400. Its totient is φ = 15392.

The previous prime is 23689. The next prime is 23719. The reversal of 23691 is 19632.

23691 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 23691 - 2¹ = 23689 is a prime.

It is a super-2 number, since 2×23691² = 1122526962, which contains 22 as substring.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (23671) 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, 85 + ... + 233.

It is an arithmetic number, because the mean of its divisors is an integer number (4050).

2²³⁶⁹¹ is an apocalyptic number.

23691 is a deficient number, since it is larger than the sum of its proper divisors (8709).

23691 is a wasteful number, since it uses less digits than its factorization.

23691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205.

The product of its digits is 324, while the sum is 21.

The square root of 23691 is about 153.9188097667. The cubic root of 23691 is about 28.7206632063.

The spelling of 23691 in words is "twenty-three thousand, six hundred ninety-one".