12520945 has 4 divisors (see below), whose sum is σ = 15025140. Its totient is φ = 10016752.

The previous prime is 12520927. The next prime is 12520957. The reversal of 12520945 is 54902521.

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 5987809 + 6533136 = 2447^2 + 2556^2 .

It is a cyclic number.

It is not a de Polignac number, because 12520945 - 2⁷ = 12520817 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, 1252090 + ... + 1252099.

It is an arithmetic number, because the mean of its divisors is an integer number (3756285).

Almost surely, 2^12520945 is an apocalyptic number.

It is an amenable number.

12520945 is a deficient number, since it is larger than the sum of its proper divisors (2504195).

12520945 is an equidigital number, since it uses as much as digits as its factorization.

12520945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504194.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 12520945 is about 3538.4947364663. The cubic root of 12520945 is about 232.2089934527.

The spelling of 12520945 in words is "twelve million, five hundred twenty thousand, nine hundred forty-five".