12557537 has 4 divisors (see below), whose sum is σ = 13218480. Its totient is φ = 11896596.

The previous prime is 12557491. The next prime is 12557549. The reversal of 12557537 is 73575521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12557537 - 2⁶ = 12557473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12557497 and 12557506.

It is not an unprimeable number, because it can be changed into a prime (12557437) 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, 330443 + ... + 330480.

It is an arithmetic number, because the mean of its divisors is an integer number (3304620).

Almost surely, 2^12557537 is an apocalyptic number.

It is an amenable number.

12557537 is a deficient number, since it is larger than the sum of its proper divisors (660943).

12557537 is an equidigital number, since it uses as much as digits as its factorization.

12557537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660942.

The product of its digits is 36750, while the sum is 35.

The square root of 12557537 is about 3543.6615244687. The cubic root of 12557537 is about 232.4349808554.

The spelling of 12557537 in words is "twelve million, five hundred fifty-seven thousand, five hundred thirty-seven".