2685491 has 4 divisors (see below), whose sum is σ = 2689584. Its totient is φ = 2681400.

The previous prime is 2685481. The next prime is 2685509. The reversal of 2685491 is 1945862.

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

It is a cyclic number.

It is not a de Polignac number, because 2685491 - 2¹⁰ = 2684467 is a prime.

It is a super-2 number, since 2×2685491² = 14423723822162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2685401) 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, 815 + ... + 2456.

It is an arithmetic number, because the mean of its divisors is an integer number (672396).

2^2685491 is an apocalyptic number.

2685491 is a deficient number, since it is larger than the sum of its proper divisors (4093).

2685491 is an equidigital number, since it uses as much as digits as its factorization.

2685491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092.

The product of its digits is 17280, while the sum is 35.

The square root of 2685491 is about 1638.7467772661. The cubic root of 2685491 is about 138.9977916596.

The spelling of 2685491 in words is "two million, six hundred eighty-five thousand, four hundred ninety-one".