2721591 has 6 divisors (see below), whose sum is σ = 3931200. Its totient is φ = 1814388.

The previous prime is 2721577. The next prime is 2721619. The reversal of 2721591 is 1951272.

2721591 is a `hidden beast` number, since 2 + 72 + 1 + 591 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-2721591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2722591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 151191 + ... + 151208.

It is an arithmetic number, because the mean of its divisors is an integer number (655200).

2^2721591 is an apocalyptic number.

2721591 is a deficient number, since it is larger than the sum of its proper divisors (1209609).

2721591 is a wasteful number, since it uses less digits than its factorization.

2721591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302405 (or 302402 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 2721591 is about 1649.7245224582. The cubic root of 2721591 is about 139.6178523869.

The spelling of 2721591 in words is "two million, seven hundred twenty-one thousand, five hundred ninety-one".