12523155 has 16 divisors (see below), whose sum is σ = 20908800. Its totient is φ = 6388448.

The previous prime is 12523153. The next prime is 12523177. The reversal of 12523155 is 55132521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12523155 - 2¹ = 12523153 is a prime.

It is a super-2 number, since 2×12523155² = 313658822308050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12523151) 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, 17805 + ... + 18494.

It is an arithmetic number, because the mean of its divisors is an integer number (1306800).

Almost surely, 2^12523155 is an apocalyptic number.

12523155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12523155 is a deficient number, since it is larger than the sum of its proper divisors (8385645).

12523155 is a wasteful number, since it uses less digits than its factorization.

12523155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36330.

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

The square root of 12523155 is about 3538.8070023668. The cubic root of 12523155 is about 232.2226546071. Note that the first 3 decimals are identical.

Adding to 12523155 its reverse (55132521), we get a palindrome (67655676).

The spelling of 12523155 in words is "twelve million, five hundred twenty-three thousand, one hundred fifty-five".