23691641 has 4 divisors (see below), whose sum is σ = 23701392. Its totient is φ = 23681892.

The previous prime is 23691631. The next prime is 23691643. The reversal of 23691641 is 14619632.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23691641 - 2²² = 19497337 is a prime.

It is a super-2 number, since 2×23691641² = 1122587706545762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23691598 and 23691607.

It is not an unprimeable number, because it can be changed into a prime (23691643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2030 + ... + 7176.

It is an arithmetic number, because the mean of its divisors is an integer number (5925348).

Almost surely, 2^23691641 is an apocalyptic number.

It is an amenable number.

23691641 is a deficient number, since it is larger than the sum of its proper divisors (9751).

23691641 is an equidigital number, since it uses as much as digits as its factorization.

23691641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9750.

The product of its digits is 7776, while the sum is 32.

The square root of 23691641 is about 4867.4059826565. The cubic root of 23691641 is about 287.2092223265.

The spelling of 23691641 in words is "twenty-three million, six hundred ninety-one thousand, six hundred forty-one".