23931661 has 8 divisors (see below), whose sum is σ = 26893440. Its totient is φ = 21130032.

The previous prime is 23931643. The next prime is 23931683. The reversal of 23931661 is 16613932.

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 23931661 - 2⁷ = 23931533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23938661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39721 + ... + 40318.

It is an arithmetic number, because the mean of its divisors is an integer number (3361680).

Almost surely, 2^23931661 is an apocalyptic number.

It is an amenable number.

23931661 is a deficient number, since it is larger than the sum of its proper divisors (2961779).

23931661 is a wasteful number, since it uses less digits than its factorization.

23931661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80075.

The product of its digits is 5832, while the sum is 31.

The square root of 23931661 is about 4891.9996933769. Note that the first 3 decimals coincide. The cubic root of 23931661 is about 288.1758707505.

The spelling of 23931661 in words is "twenty-three million, nine hundred thirty-one thousand, six hundred sixty-one".