12915145 has 4 divisors (see below), whose sum is σ = 15498180. Its totient is φ = 10332112.

The previous prime is 12915131. The next prime is 12915163. The reversal of 12915145 is 54151921.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8088336 + 4826809 = 2844^2 + 2197^2 .

It is a cyclic number.

It is not a de Polignac number, because 12915145 - 2⁹ = 12914633 is a prime.

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, 1291510 + ... + 1291519.

It is an arithmetic number, because the mean of its divisors is an integer number (3874545).

Almost surely, 2^12915145 is an apocalyptic number.

It is an amenable number.

12915145 is a deficient number, since it is larger than the sum of its proper divisors (2583035).

12915145 is an equidigital number, since it uses as much as digits as its factorization.

12915145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583034.

The product of its digits is 1800, while the sum is 28.

The square root of 12915145 is about 3593.7647391002. The cubic root of 12915145 is about 234.6207554363.

The spelling of 12915145 in words is "twelve million, nine hundred fifteen thousand, one hundred forty-five".