2557 has 2 divisors, whose sum is σ = 2558.
Its totient is φ = 2556.
The previous prime is 2551. The next prime is 2579. The reversal of 2557 is 7552.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 2116 + 441 = 46^2 + 21^2
It is a cyclic number.
It is not a de Polignac number, because 2557 - 23 = 2549 is a prime.
It is a Chen prime.
It is a pancake number, because a pancake can be divided into 2557 parts by 71 straight cuts.
2557 is a lucky number.
It is a plaindrome in base 10.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2551) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278 + 1279.
It is an arithmetic number, because the mean of its divisors is an integer number (1279).
22557 is an apocalyptic number.
It is an amenable number.
2557 is a deficient number, since it is larger than the sum of its proper divisors (1).
2557 is an equidigital number, since it uses as much as digits as its factorization.
2557 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 350, while the sum is 19.
The square root of 2557 is about 50.5667875191.
The cubic root of 2557 is about 13.6744618098.
It can be divided in two parts, 255 and 7, that added together give a palindrome (262).
The spelling of 2557 in words is "two thousand, five hundred fifty-seven".