12531551 has 4 divisors (see below), whose sum is σ = 12538632. Its totient is φ = 12524472.

The previous prime is 12531539. The next prime is 12531553. The reversal of 12531551 is 15513521.

It is a happy number.

12531551 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15513521 = 29 ⋅534949.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12531551 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, 1760 + ... + 5306.

It is an arithmetic number, because the mean of its divisors is an integer number (3134658).

Almost surely, 2^12531551 is an apocalyptic number.

12531551 is a deficient number, since it is larger than the sum of its proper divisors (7081).

12531551 is an equidigital number, since it uses as much as digits as its factorization.

12531551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7080.

The product of its digits is 750, while the sum is 23.

The square root of 12531551 is about 3539.9930790893. The cubic root of 12531551 is about 232.2745399837.

The spelling of 12531551 in words is "twelve million, five hundred thirty-one thousand, five hundred fifty-one".