2789561 has 4 divisors (see below), whose sum is σ = 2936400. Its totient is φ = 2642724.

The previous prime is 2789551. The next prime is 2789573. The reversal of 2789561 is 1659872.

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 a de Polignac number, because none of the positive numbers 2^k-2789561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2789551) 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, 73391 + ... + 73428.

It is an arithmetic number, because the mean of its divisors is an integer number (734100).

2^2789561 is an apocalyptic number.

It is an amenable number.

2789561 is a deficient number, since it is larger than the sum of its proper divisors (146839).

2789561 is a wasteful number, since it uses less digits than its factorization.

2789561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146838.

The product of its digits is 30240, while the sum is 38.

The square root of 2789561 is about 1670.1978924666. The cubic root of 2789561 is about 140.7705975806.

The spelling of 2789561 in words is "two million, seven hundred eighty-nine thousand, five hundred sixty-one".