2551243 has 4 divisors (see below), whose sum is σ = 2587248. Its totient is φ = 2515240.

The previous prime is 2551223. The next prime is 2551247. The reversal of 2551243 is 3421552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2551243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2551247) 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, 17896 + ... + 18037.

It is an arithmetic number, because the mean of its divisors is an integer number (646812).

2^2551243 is an apocalyptic number.

2551243 is a deficient number, since it is larger than the sum of its proper divisors (36005).

2551243 is an equidigital number, since it uses as much as digits as its factorization.

2551243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36004.

The product of its digits is 1200, while the sum is 22.

The square root of 2551243 is about 1597.2610932468. The cubic root of 2551243 is about 136.6419156711.

Adding to 2551243 its reverse (3421552), we get a palindrome (5972795).

The spelling of 2551243 in words is "two million, five hundred fifty-one thousand, two hundred forty-three".