2991271 has 4 divisors (see below), whose sum is σ = 2996200. Its totient is φ = 2986344.

The previous prime is 2991253. The next prime is 2991277. The reversal of 2991271 is 1721992.

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 2991271 - 2⁵ = 2991239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991277) 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, 1401 + ... + 2818.

It is an arithmetic number, because the mean of its divisors is an integer number (749050).

2^2991271 is an apocalyptic number.

2991271 is a deficient number, since it is larger than the sum of its proper divisors (4929).

2991271 is an equidigital number, since it uses as much as digits as its factorization.

2991271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4928.

The product of its digits is 2268, while the sum is 31.

The square root of 2991271 is about 1729.5291266700. The cubic root of 2991271 is about 144.0849389575.

The spelling of 2991271 in words is "two million, nine hundred ninety-one thousand, two hundred seventy-one".