2549861 has 4 divisors (see below), whose sum is σ = 2591724. Its totient is φ = 2508000.

The previous prime is 2549821. The next prime is 2549863. The reversal of 2549861 is 1689452.

2549861 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 37636 + 2512225 = 194^2 + 1585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2549861 is a prime.

It is a super-2 number, since 2×2549861² = 13003582238642, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2549863) 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, 20840 + ... + 20961.

It is an arithmetic number, because the mean of its divisors is an integer number (647931).

2^2549861 is an apocalyptic number.

It is an amenable number.

2549861 is a deficient number, since it is larger than the sum of its proper divisors (41863).

2549861 is an equidigital number, since it uses as much as digits as its factorization.

2549861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41862.

The product of its digits is 17280, while the sum is 35.

The square root of 2549861 is about 1596.8284190858. The cubic root of 2549861 is about 136.6172383882.

The spelling of 2549861 in words is "two million, five hundred forty-nine thousand, eight hundred sixty-one".