23661187 has 16 divisors (see below), whose sum is σ = 26966880. Its totient is φ = 20734560.

The previous prime is 23661173. The next prime is 23661199. The reversal of 23661187 is 78116632.

It is a de Polignac number, because none of the positive numbers 2^k-23661187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23661487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38293 + ... + 38905.

It is an arithmetic number, because the mean of its divisors is an integer number (1685430).

Almost surely, 2^23661187 is an apocalyptic number.

23661187 is a deficient number, since it is larger than the sum of its proper divisors (3305693).

23661187 is an equidigital number, since it uses as much as digits as its factorization.

23661187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 653 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 23661187 is about 4864.2766163120. The cubic root of 23661187 is about 287.0861068912.

Subtracting 23661187 from its reverse (78116632), we obtain a palindrome (54455445).

It can be divided in two parts, 2366 and 1187, that added together give a palindrome (3553).

The spelling of 23661187 in words is "twenty-three million, six hundred sixty-one thousand, one hundred eighty-seven".