2609891 has 4 divisors (see below), whose sum is σ = 2763432. Its totient is φ = 2456352.

The previous prime is 2609813. The next prime is 2609899. The reversal of 2609891 is 1989062.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2609891 is a prime.

It is a super-3 number, since 3×2609891³ = 53332060608980804913, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2609899) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 76745 + ... + 76778.

It is an arithmetic number, because the mean of its divisors is an integer number (690858).

2^2609891 is an apocalyptic number.

2609891 is a deficient number, since it is larger than the sum of its proper divisors (153541).

2609891 is a wasteful number, since it uses less digits than its factorization.

2609891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153540.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 2609891 is about 1615.5157071350. The cubic root of 2609891 is about 137.6810353696.

The spelling of 2609891 in words is "two million, six hundred nine thousand, eight hundred ninety-one".