2661557 has 2 divisors, whose sum is σ = 2661558. Its totient is φ = 2661556.

The previous prime is 2661553. The next prime is 2661569. The reversal of 2661557 is 7551662.

It is a happy number.

2661557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2390116 + 271441 = 1546^2 + 521^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661557 - 2² = 2661553 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661553) 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, 1330778 + 1330779.

It is an arithmetic number, because the mean of its divisors is an integer number (1330779).

2^2661557 is an apocalyptic number.

It is an amenable number.

2661557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661557 is an equidigital number, since it uses as much as digits as its factorization.

2661557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 32.

The square root of 2661557 is about 1631.4279021765. The cubic root of 2661557 is about 138.5836271139.

The spelling of 2661557 in words is "two million, six hundred sixty-one thousand, five hundred fifty-seven".