23153661 has 16 divisors (see below), whose sum is σ = 34518720. Its totient is φ = 15338160.

The previous prime is 23153653. The next prime is 23153681. The reversal of 23153661 is 16635132.

It is not a de Polignac number, because 23153661 - 2³ = 23153653 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23153681) 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, 1771 + ... + 7031.

It is an arithmetic number, because the mean of its divisors is an integer number (2157420).

Almost surely, 2^23153661 is an apocalyptic number.

It is an amenable number.

23153661 is a deficient number, since it is larger than the sum of its proper divisors (11365059).

23153661 is a wasteful number, since it uses less digits than its factorization.

23153661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5433 (or 5427 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 23153661 is about 4811.8251215105. The cubic root of 23153661 is about 285.0186137427.

Adding to 23153661 its reverse (16635132), we get a palindrome (39788793).

The spelling of 23153661 in words is "twenty-three million, one hundred fifty-three thousand, six hundred sixty-one".