2551121 has 4 divisors (see below), whose sum is σ = 2555712. Its totient is φ = 2546532.

The previous prime is 2551103. The next prime is 2551123. The reversal of 2551121 is 1211552.

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.

It is a cyclic number.

It is not a de Polignac number, because 2551121 - 2⁶ = 2551057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2551121.

It is not an unprimeable number, because it can be changed into a prime (2551123) 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, 1325 + ... + 2618.

It is an arithmetic number, because the mean of its divisors is an integer number (638928).

2^2551121 is an apocalyptic number.

It is an amenable number.

2551121 is a deficient number, since it is larger than the sum of its proper divisors (4591).

2551121 is an equidigital number, since it uses as much as digits as its factorization.

2551121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590.

The product of its digits is 100, while the sum is 17.

The square root of 2551121 is about 1597.2229024153. Note that the first 3 decimals coincide. The cubic root of 2551121 is about 136.6397375721.

Adding to 2551121 its reverse (1211552), we get a palindrome (3762673).

The spelling of 2551121 in words is "two million, five hundred fifty-one thousand, one hundred twenty-one".