23145215 has 4 divisors (see below), whose sum is σ = 27774264. Its totient is φ = 18516168.

The previous prime is 23145209. The next prime is 23145271. The reversal of 23145215 is 51254132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23145215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2314517 + ... + 2314526.

It is an arithmetic number, because the mean of its divisors is an integer number (6943566).

Almost surely, 2^23145215 is an apocalyptic number.

23145215 is a deficient number, since it is larger than the sum of its proper divisors (4629049).

23145215 is an equidigital number, since it uses as much as digits as its factorization.

23145215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629048.

The product of its digits is 1200, while the sum is 23.

The square root of 23145215 is about 4810.9474118930. The cubic root of 23145215 is about 284.9839531336.

Adding to 23145215 its reverse (51254132), we get a palindrome (74399347).

The spelling of 23145215 in words is "twenty-three million, one hundred forty-five thousand, two hundred fifteen".