2551231 has 4 divisors (see below), whose sum is σ = 2566152. Its totient is φ = 2536312.

The previous prime is 2551223. The next prime is 2551247. The reversal of 2551231 is 1321552.

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

It is a cyclic number.

It is not a de Polignac number, because 2551231 - 2³ = 2551223 is a prime.

It is a super-2 number, since 2×2551231² = 13017559230722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 2551199 and 2551208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551531) 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, 7201 + ... + 7546.

It is an arithmetic number, because the mean of its divisors is an integer number (641538).

2^2551231 is an apocalyptic number.

2551231 is a deficient number, since it is larger than the sum of its proper divisors (14921).

2551231 is a wasteful number, since it uses less digits than its factorization.

2551231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14920.

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

The square root of 2551231 is about 1597.2573368121. The cubic root of 2551231 is about 136.6417014349.

Adding to 2551231 its reverse (1321552), we get a palindrome (3872783).

The spelling of 2551231 in words is "two million, five hundred fifty-one thousand, two hundred thirty-one".