23215155 has 8 divisors (see below), whose sum is σ = 37144272. Its totient is φ = 12381408.

The previous prime is 23215151. The next prime is 23215189. The reversal of 23215155 is 55151232.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23215155 - 2² = 23215151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23215151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 773824 + ... + 773853.

It is an arithmetic number, because the mean of its divisors is an integer number (4643034).

Almost surely, 2^23215155 is an apocalyptic number.

23215155 is a deficient number, since it is larger than the sum of its proper divisors (13929117).

23215155 is a wasteful number, since it uses less digits than its factorization.

23215155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547685.

The product of its digits is 1500, while the sum is 24.

The square root of 23215155 is about 4818.2107674945. The cubic root of 23215155 is about 285.2707184508.

Adding to 23215155 its reverse (55151232), we get a palindrome (78366387).

The spelling of 23215155 in words is "twenty-three million, two hundred fifteen thousand, one hundred fifty-five".