12051551 has 4 divisors (see below), whose sum is σ = 12064704. Its totient is φ = 12038400.

The previous prime is 12051541. The next prime is 12051553. The reversal of 12051551 is 15515021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15515021 = 271 ⋅57251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12051551 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 (12051553) 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, 5090 + ... + 7071.

It is an arithmetic number, because the mean of its divisors is an integer number (3016176).

Almost surely, 2^12051551 is an apocalyptic number.

12051551 is a deficient number, since it is larger than the sum of its proper divisors (13153).

12051551 is an equidigital number, since it uses as much as digits as its factorization.

12051551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13152.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 12051551 is about 3471.5343869822. The cubic root of 12051551 is about 229.2702199699.

Adding to 12051551 its reverse (15515021), we get a palindrome (27566572).

The spelling of 12051551 in words is "twelve million, fifty-one thousand, five hundred fifty-one".