2553661 has 8 divisors (see below), whose sum is σ = 2820384. Its totient is φ = 2292720.

The previous prime is 2553659. The next prime is 2553671. The reversal of 2553661 is 1663552.

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

It is a cyclic number.

It is not a de Polignac number, because 2553661 - 2¹ = 2553659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2553601) 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, 486 + ... + 2311.

It is an arithmetic number, because the mean of its divisors is an integer number (352548).

2^2553661 is an apocalyptic number.

It is an amenable number.

2553661 is a deficient number, since it is larger than the sum of its proper divisors (266723).

2553661 is a wasteful number, since it uses less digits than its factorization.

2553661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891.

The product of its digits is 5400, while the sum is 28.

The square root of 2553661 is about 1598.0178346940. The cubic root of 2553661 is about 136.6850705601.

It can be divided in two parts, 255 and 3661, that added together give a triangular number (3916 = T₈₈).

The spelling of 2553661 in words is "two million, five hundred fifty-three thousand, six hundred sixty-one".