2561619 has 4 divisors (see below), whose sum is σ = 3415496. Its totient is φ = 1707744.

The previous prime is 2561593. The next prime is 2561627. The reversal of 2561619 is 9161652.

2561619 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2561619 - 2⁷ = 2561491 is a prime.

It is a super-2 number, since 2×2561619² = 13123783802322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426934 + ... + 426939.

It is an arithmetic number, because the mean of its divisors is an integer number (853874).

2^2561619 is an apocalyptic number.

2561619 is a deficient number, since it is larger than the sum of its proper divisors (853877).

2561619 is an equidigital number, since it uses as much as digits as its factorization.

2561619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853876.

The product of its digits is 3240, while the sum is 30.

The square root of 2561619 is about 1600.5058575338. The cubic root of 2561619 is about 136.8269076889.

The spelling of 2561619 in words is "two million, five hundred sixty-one thousand, six hundred nineteen".