2687557 has 2 divisors, whose sum is σ = 2687558. Its totient is φ = 2687556.

The previous prime is 2687551. The next prime is 2687567. The reversal of 2687557 is 7557862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2643876 + 43681 = 1626^2 + 209^2 .

It is a cyclic number.

It is not a de Polignac number, because 2687557 - 2³ = 2687549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2687551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343778 + 1343779.

It is an arithmetic number, because the mean of its divisors is an integer number (1343779).

2^2687557 is an apocalyptic number.

It is an amenable number.

2687557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2687557 is an equidigital number, since it uses as much as digits as its factorization.

2687557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 40.

The square root of 2687557 is about 1639.3770158203. The cubic root of 2687557 is about 139.0334270831.

The spelling of 2687557 in words is "two million, six hundred eighty-seven thousand, five hundred fifty-seven".