2991591 has 6 divisors (see below), whose sum is σ = 4321200. Its totient is φ = 1994388.

The previous prime is 2991589. The next prime is 2991601. The reversal of 2991591 is 1951992.

It is not a de Polignac number, because 2991591 - 2¹ = 2991589 is a prime.

It is a super-2 number, since 2×2991591² = 17899233422562, which contains 22 as substring.

2991591 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991511) 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, 166191 + ... + 166208.

It is an arithmetic number, because the mean of its divisors is an integer number (720200).

2^2991591 is an apocalyptic number.

2991591 is a deficient number, since it is larger than the sum of its proper divisors (1329609).

2991591 is a wasteful number, since it uses less digits than its factorization.

2991591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332405 (or 332402 counting only the distinct ones).

The product of its digits is 7290, while the sum is 36.

The square root of 2991591 is about 1729.6216349248. The cubic root of 2991591 is about 144.0900767441.

The spelling of 2991591 in words is "two million, nine hundred ninety-one thousand, five hundred ninety-one".