23185129 has 4 divisors (see below), whose sum is σ = 25292880. Its totient is φ = 21077380.

The previous prime is 23185109. The next prime is 23185133. The reversal of 23185129 is 92158132.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23185129 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23185129.

It is not an unprimeable number, because it can be changed into a prime (23185109) 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 3 ways as a sum of consecutive naturals, for example, 1053859 + ... + 1053880.

It is an arithmetic number, because the mean of its divisors is an integer number (6323220).

Almost surely, 2^23185129 is an apocalyptic number.

It is an amenable number.

23185129 is a deficient number, since it is larger than the sum of its proper divisors (2107751).

23185129 is a wasteful number, since it uses less digits than its factorization.

23185129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107750.

The product of its digits is 4320, while the sum is 31.

The square root of 23185129 is about 4815.0938723975. The cubic root of 23185129 is about 285.1476776458.

It can be divided in two parts, 2318 and 5129, that added together give a palindrome (7447).

The spelling of 23185129 in words is "twenty-three million, one hundred eighty-five thousand, one hundred twenty-nine".