2557231 has 2 divisors, whose sum is σ = 2557232. Its totient is φ = 2557230.

The previous prime is 2557213. The next prime is 2557241. The reversal of 2557231 is 1327552.

2557231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (2557213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2557231 - 2⁵ = 2557199 is a prime.

It is a super-2 number, since 2×2557231² = 13078860774722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2557196 and 2557205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2557201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278615 + 1278616.

It is an arithmetic number, because the mean of its divisors is an integer number (1278616).

2^2557231 is an apocalyptic number.

2557231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557231 is an equidigital number, since it uses as much as digits as its factorization.

2557231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 25.

The square root of 2557231 is about 1599.1344533841. The cubic root of 2557231 is about 136.7487358218.

The spelling of 2557231 in words is "two million, five hundred fifty-seven thousand, two hundred thirty-one".