2551281 has 4 divisors (see below), whose sum is σ = 3401712. Its totient is φ = 1700852.

The previous prime is 2551279. The next prime is 2551313. The reversal of 2551281 is 1821552.

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 2551281 - 2¹ = 2551279 is a prime.

It is a super-2 number, since 2×2551281² = 13018069481922, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2551481) 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, 425211 + ... + 425216.

It is an arithmetic number, because the mean of its divisors is an integer number (850428).

2^2551281 is an apocalyptic number.

It is an amenable number.

2551281 is a deficient number, since it is larger than the sum of its proper divisors (850431).

2551281 is an equidigital number, since it uses as much as digits as its factorization.

2551281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850430.

The product of its digits is 800, while the sum is 24.

The square root of 2551281 is about 1597.2729885652. The cubic root of 2551281 is about 136.6425940812.

The spelling of 2551281 in words is "two million, five hundred fifty-one thousand, two hundred eighty-one".