12361551 has 4 divisors (see below), whose sum is σ = 16482072. Its totient is φ = 8241032.

The previous prime is 12361549. The next prime is 12361577. The reversal of 12361551 is 15516321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15516321 = 3 ⋅5172107.

It is a cyclic number.

It is not a de Polignac number, because 12361551 - 2¹ = 12361549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12361351) 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, 2060256 + ... + 2060261.

It is an arithmetic number, because the mean of its divisors is an integer number (4120518).

Almost surely, 2^12361551 is an apocalyptic number.

12361551 is a deficient number, since it is larger than the sum of its proper divisors (4120521).

12361551 is an equidigital number, since it uses as much as digits as its factorization.

12361551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4120520.

The product of its digits is 900, while the sum is 24.

The square root of 12361551 is about 3515.8997425979. The cubic root of 12361551 is about 231.2194275629.

Adding to 12361551 its reverse (15516321), we get a palindrome (27877872).

The spelling of 12361551 in words is "twelve million, three hundred sixty-one thousand, five hundred fifty-one".