2561995 has 8 divisors (see below), whose sum is σ = 3173760. Its totient is φ = 1983360.

The previous prime is 2561987. The next prime is 2562011. The reversal of 2561995 is 5991652.

2561995 is nontrivially palindromic in base 6.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2561995 - 2³ = 2561987 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8110 + ... + 8419.

It is an arithmetic number, because the mean of its divisors is an integer number (396720).

2^2561995 is an apocalyptic number.

2561995 is a deficient number, since it is larger than the sum of its proper divisors (611765).

2561995 is a wasteful number, since it uses less digits than its factorization.

2561995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16565.

The product of its digits is 24300, while the sum is 37.

The square root of 2561995 is about 1600.6233160866. The cubic root of 2561995 is about 136.8336019449.

The spelling of 2561995 in words is "two million, five hundred sixty-one thousand, nine hundred ninety-five".