2549561 has 4 divisors (see below), whose sum is σ = 2913792. Its totient is φ = 2185332.

The previous prime is 2549557. The next prime is 2549563. The reversal of 2549561 is 1659452.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2549561 - 2² = 2549557 is a prime.

It is a super-2 number, since 2×2549561² = 13000522585442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2549563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182105 + ... + 182118.

It is an arithmetic number, because the mean of its divisors is an integer number (728448).

2^2549561 is an apocalyptic number.

It is an amenable number.

2549561 is a deficient number, since it is larger than the sum of its proper divisors (364231).

2549561 is an equidigital number, since it uses as much as digits as its factorization.

2549561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364230.

The product of its digits is 10800, while the sum is 32.

The square root of 2549561 is about 1596.7344801187. The cubic root of 2549561 is about 136.6118803473.

The spelling of 2549561 in words is "two million, five hundred forty-nine thousand, five hundred sixty-one".