2660621 has 2 divisors, whose sum is σ = 2660622. Its totient is φ = 2660620.

The previous prime is 2660611. The next prime is 2660639. The reversal of 2660621 is 1260662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2656900 + 3721 = 1630^2 + 61^2 .

It is a cyclic number.

It is not a de Polignac number, because 2660621 - 2⁶ = 2660557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2660611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330310 + 1330311.

It is an arithmetic number, because the mean of its divisors is an integer number (1330311).

2^2660621 is an apocalyptic number.

It is an amenable number.

2660621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2660621 is an equidigital number, since it uses as much as digits as its factorization.

2660621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 2660621 is about 1631.1410116848. The cubic root of 2660621 is about 138.5673797966.

The spelling of 2660621 in words is "two million, six hundred sixty thousand, six hundred twenty-one".