23181229 has 4 divisors (see below), whose sum is σ = 23397984. Its totient is φ = 22964476.

The previous prime is 23181209. The next prime is 23181233. The reversal of 23181229 is 92218132.

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-23181229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23181197 and 23181206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23181209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108217 + ... + 108430.

It is an arithmetic number, because the mean of its divisors is an integer number (5849496).

Almost surely, 2^23181229 is an apocalyptic number.

It is an amenable number.

23181229 is a deficient number, since it is larger than the sum of its proper divisors (216755).

23181229 is a wasteful number, since it uses less digits than its factorization.

23181229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216754.

The product of its digits is 1728, while the sum is 28.

The square root of 23181229 is about 4814.6888788373. The cubic root of 23181229 is about 285.1316883983.

The spelling of 23181229 in words is "twenty-three million, one hundred eighty-one thousand, two hundred twenty-nine".