2559649 has 4 divisors (see below), whose sum is σ = 2563264. Its totient is φ = 2556036.

The previous prime is 2559631. The next prime is 2559677. The reversal of 2559649 is 9469552.

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.

It is a cyclic number.

It is not a de Polignac number, because 2559649 - 2⁵ = 2559617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2559619) 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, 357 + ... + 2290.

It is an arithmetic number, because the mean of its divisors is an integer number (640816).

2^2559649 is an apocalyptic number.

It is an amenable number.

2559649 is a deficient number, since it is larger than the sum of its proper divisors (3615).

2559649 is an equidigital number, since it uses as much as digits as its factorization.

2559649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3614.

The product of its digits is 97200, while the sum is 40.

The square root of 2559649 is about 1599.8903087399. The cubic root of 2559649 is about 136.7918233488.

Subtracting 2559649 from its reverse (9469552), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2559649 in words is "two million, five hundred fifty-nine thousand, six hundred forty-nine".