2790561 has 4 divisors (see below), whose sum is σ = 3720752. Its totient is φ = 1860372.

The previous prime is 2790547. The next prime is 2790563. The reversal of 2790561 is 1650972.

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 not a de Polignac number, because 2790561 - 2⁶ = 2790497 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2790563) 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, 465091 + ... + 465096.

It is an arithmetic number, because the mean of its divisors is an integer number (930188).

2^2790561 is an apocalyptic number.

It is an amenable number.

2790561 is a deficient number, since it is larger than the sum of its proper divisors (930191).

2790561 is an equidigital number, since it uses as much as digits as its factorization.

2790561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930190.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 2790561 is about 1670.4972313656. The cubic root of 2790561 is about 140.7874166882.

It can be divided in two parts, 27905 and 61, that added together give a triangular number (27966 = T₂₃₆).

The spelling of 2790561 in words is "two million, seven hundred ninety thousand, five hundred sixty-one".