2642609 has 2 divisors, whose sum is σ = 2642610. Its totient is φ = 2642608.

The previous prime is 2642603. The next prime is 2642621. The reversal of 2642609 is 9062462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1682209 + 960400 = 1297^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 2642609 - 2¹⁶ = 2577073 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2642603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321304 + 1321305.

It is an arithmetic number, because the mean of its divisors is an integer number (1321305).

2^2642609 is an apocalyptic number.

It is an amenable number.

2642609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2642609 is an equidigital number, since it uses as much as digits as its factorization.

2642609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 2642609 is about 1625.6103469159. The cubic root of 2642609 is about 138.2539781312.

The spelling of 2642609 in words is "two million, six hundred forty-two thousand, six hundred nine".