2653661 has 4 divisors (see below), whose sum is σ = 2658432. Its totient is φ = 2648892.

The previous prime is 2653633. The next prime is 2653681. The reversal of 2653661 is 1663562.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1663562 = 2 ⋅831781.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2653661 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 (2653601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1421 + ... + 2706.

It is an arithmetic number, because the mean of its divisors is an integer number (664608).

2^2653661 is an apocalyptic number.

It is an amenable number.

2653661 is a deficient number, since it is larger than the sum of its proper divisors (4771).

2653661 is an equidigital number, since it uses as much as digits as its factorization.

2653661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4770.

The product of its digits is 6480, while the sum is 29.

The square root of 2653661 is about 1629.0061387239. The cubic root of 2653661 is about 138.4464467328.

Subtracting from 2653661 its reverse (1663562), we obtain a palindrome (990099).

The spelling of 2653661 in words is "two million, six hundred fifty-three thousand, six hundred sixty-one".