12507557 has 4 divisors (see below), whose sum is σ = 12522636. Its totient is φ = 12492480.

The previous prime is 12507541. The next prime is 12507559. The reversal of 12507557 is 75570521.

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 8288641 + 4218916 = 2879^2 + 2054^2 .

It is a cyclic number.

It is not a de Polignac number, because 12507557 - 2⁴ = 12507541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12507559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6218 + ... + 7979.

It is an arithmetic number, because the mean of its divisors is an integer number (3130659).

Almost surely, 2^12507557 is an apocalyptic number.

It is an amenable number.

12507557 is a deficient number, since it is larger than the sum of its proper divisors (15079).

12507557 is an equidigital number, since it uses as much as digits as its factorization.

12507557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15078.

The product of its (nonzero) digits is 12250, while the sum is 32.

The square root of 12507557 is about 3536.6024656441. The cubic root of 12507557 is about 232.1262009081.

The spelling of 12507557 in words is "twelve million, five hundred seven thousand, five hundred fifty-seven".