2549661 has 8 divisors (see below), whose sum is σ = 3407520. Its totient is φ = 1695792.

The previous prime is 2549647. The next prime is 2549669. The reversal of 2549661 is 1669452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2549661 - 2⁶ = 2549597 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 2¹¹ + 5⁹ + 4⁷ + 9⁶ + 6 + 6⁶ + 1 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2549669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1171 + ... + 2543.

It is an arithmetic number, because the mean of its divisors is an integer number (425940).

2^2549661 is an apocalyptic number.

It is an amenable number.

2549661 is a deficient number, since it is larger than the sum of its proper divisors (857859).

2549661 is a wasteful number, since it uses less digits than its factorization.

2549661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995.

The product of its digits is 12960, while the sum is 33.

The square root of 2549661 is about 1596.7657937218. The cubic root of 2549661 is about 136.6136664076.

The spelling of 2549661 in words is "two million, five hundred forty-nine thousand, six hundred sixty-one".