2991311 has 4 divisors (see below), whose sum is σ = 3121392. Its totient is φ = 2861232.

The previous prime is 2991299. The next prime is 2991353. The reversal of 2991311 is 1131992.

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 2991311 - 2¹⁴ = 2974927 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 (2991361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65006 + ... + 65051.

It is an arithmetic number, because the mean of its divisors is an integer number (780348).

2^2991311 is an apocalyptic number.

2991311 is a deficient number, since it is larger than the sum of its proper divisors (130081).

2991311 is a wasteful number, since it uses less digits than its factorization.

2991311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130080.

The product of its digits is 486, while the sum is 26.

The square root of 2991311 is about 1729.5406904725. The cubic root of 2991311 is about 144.0855812009.

The spelling of 2991311 in words is "two million, nine hundred ninety-one thousand, three hundred eleven".