2681591 has 4 divisors (see below), whose sum is σ = 2925384. Its totient is φ = 2437800.

The previous prime is 2681579. The next prime is 2681611. The reversal of 2681591 is 1951862.

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 2681591 - 2¹⁰ = 2680567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2681521) 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, 121880 + ... + 121901.

It is an arithmetic number, because the mean of its divisors is an integer number (731346).

2^2681591 is an apocalyptic number.

2681591 is a deficient number, since it is larger than the sum of its proper divisors (243793).

2681591 is a wasteful number, since it uses less digits than its factorization.

2681591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243792.

The product of its digits is 4320, while the sum is 32.

The square root of 2681591 is about 1637.5564112421. The cubic root of 2681591 is about 138.9304726211.

The spelling of 2681591 in words is "two million, six hundred eighty-one thousand, five hundred ninety-one".