2559991 has 8 divisors (see below), whose sum is σ = 2940320. Its totient is φ = 2183328.

The previous prime is 2559989. The next prime is 2560021. The reversal of 2559991 is 1999552.

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

It is not a de Polignac number, because 2559991 - 2¹ = 2559989 is a prime.

It is a Duffinian number.

2559991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2559901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 805 + ... + 2401.

It is an arithmetic number, because the mean of its divisors is an integer number (367540).

2^2559991 is an apocalyptic number.

2559991 is a deficient number, since it is larger than the sum of its proper divisors (380329).

2559991 is a wasteful number, since it uses less digits than its factorization.

2559991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833.

The product of its digits is 36450, while the sum is 40.

The square root of 2559991 is about 1599.9971874975. The cubic root of 2559991 is about 136.7979154237.

The spelling of 2559991 in words is "two million, five hundred fifty-nine thousand, nine hundred ninety-one".