2557801 has 4 divisors (see below), whose sum is σ = 2562372. Its totient is φ = 2553232.

The previous prime is 2557781. The next prime is 2557813. The reversal of 2557801 is 1087552.

2557801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1345600 + 1212201 = 1160^2 + 1101^2 .

It is a cyclic number.

It is not a de Polignac number, because 2557801 - 2⁷ = 2557673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2557801.

It is not an unprimeable number, because it can be changed into a prime (2557861) 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 in 3 ways as a sum of consecutive naturals, for example, 1306 + ... + 2611.

It is an arithmetic number, because the mean of its divisors is an integer number (640593).

2^2557801 is an apocalyptic number.

2557801 is the 1306-th pentagonal number.

It is an amenable number.

2557801 is a deficient number, since it is larger than the sum of its proper divisors (4571).

2557801 is an equidigital number, since it uses as much as digits as its factorization.

2557801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4570.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 2557801 is about 1599.3126648658. The cubic root of 2557801 is about 136.7588953770.

The spelling of 2557801 in words is "two million, five hundred fifty-seven thousand, eight hundred one".