23131666 has 4 divisors (see below), whose sum is σ = 34697502. Its totient is φ = 11565832.

The previous prime is 23131651. The next prime is 23131681. The reversal of 23131666 is 66613132.

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

It is an interprime number because it is at equal distance from previous prime (23131651) and next prime (23131681).

It can be written as a sum of positive squares in only one way, i.e., 19616041 + 3515625 = 4429^2 + 1875^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5782915 + ... + 5782918.

Almost surely, 2^23131666 is an apocalyptic number.

23131666 is a deficient number, since it is larger than the sum of its proper divisors (11565836).

23131666 is a wasteful number, since it uses less digits than its factorization.

23131666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11565835.

The product of its digits is 3888, while the sum is 28.

The square root of 23131666 is about 4809.5390631536. The cubic root of 23131666 is about 284.9283332676.

Adding to 23131666 its reverse (66613132), we get a palindrome (89744798).

The spelling of 23131666 in words is "twenty-three million, one hundred thirty-one thousand, six hundred sixty-six".