2551321 has 4 divisors (see below), whose sum is σ = 2662272. Its totient is φ = 2440372.

The previous prime is 2551313. The next prime is 2551349. The reversal of 2551321 is 1231552.

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 2551321 - 2³ = 2551313 is a prime.

It is a Duffinian number.

2551321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2551421) 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, 55441 + ... + 55486.

It is an arithmetic number, because the mean of its divisors is an integer number (665568).

2^2551321 is an apocalyptic number.

It is an amenable number.

2551321 is a deficient number, since it is larger than the sum of its proper divisors (110951).

2551321 is a wasteful number, since it uses less digits than its factorization.

2551321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110950.

The product of its digits is 300, while the sum is 19.

The square root of 2551321 is about 1597.2855098573. The cubic root of 2551321 is about 136.6433081898.

Adding to 2551321 its reverse (1231552), we get a palindrome (3782873).

The spelling of 2551321 in words is "two million, five hundred fifty-one thousand, three hundred twenty-one".