12531557 has 4 divisors (see below), whose sum is σ = 12543840. Its totient is φ = 12519276.

The previous prime is 12531553. The next prime is 12531569. The reversal of 12531557 is 75513521.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75513521 = 317 ⋅238213.

It is a cyclic number.

It is not a de Polignac number, because 12531557 - 2² = 12531553 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 (12531553) 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, 4457 + ... + 6702.

It is an arithmetic number, because the mean of its divisors is an integer number (3135960).

Almost surely, 2^12531557 is an apocalyptic number.

It is an amenable number.

12531557 is a deficient number, since it is larger than the sum of its proper divisors (12283).

12531557 is a wasteful number, since it uses less digits than its factorization.

12531557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12282.

The product of its digits is 5250, while the sum is 29.

The square root of 12531557 is about 3539.9939265485. The cubic root of 12531557 is about 232.2745770541.

The spelling of 12531557 in words is "twelve million, five hundred thirty-one thousand, five hundred fifty-seven".