12533551 has 4 divisors (see below), whose sum is σ = 13078512. Its totient is φ = 11988592.

The previous prime is 12533531. The next prime is 12533561. The reversal of 12533551 is 15533521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15533521 = 151 ⋅102871.

It is a cyclic number.

It is not a de Polignac number, because 12533551 - 2⁵ = 12533519 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 (12533501) 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, 272446 + ... + 272491.

It is an arithmetic number, because the mean of its divisors is an integer number (3269628).

Almost surely, 2^12533551 is an apocalyptic number.

12533551 is a deficient number, since it is larger than the sum of its proper divisors (544961).

12533551 is an equidigital number, since it uses as much as digits as its factorization.

12533551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544960.

The product of its digits is 2250, while the sum is 25.

The square root of 12533551 is about 3540.2755542472. The cubic root of 12533551 is about 232.2868961124.

The spelling of 12533551 in words is "twelve million, five hundred thirty-three thousand, five hundred fifty-one".