2991243 has 4 divisors (see below), whose sum is σ = 3988328. Its totient is φ = 1994160.

The previous prime is 2991239. The next prime is 2991253. The reversal of 2991243 is 3421992.

2991243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2991243 - 2² = 2991239 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2991243.

It is not an unprimeable number, because it can be changed into a prime (2991203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498538 + ... + 498543.

It is an arithmetic number, because the mean of its divisors is an integer number (997082).

2^2991243 is an apocalyptic number.

2991243 is a deficient number, since it is larger than the sum of its proper divisors (997085).

2991243 is an equidigital number, since it uses as much as digits as its factorization.

2991243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997084.

The product of its digits is 3888, while the sum is 30.

The square root of 2991243 is about 1729.5210319623. The cubic root of 2991243 is about 144.0844893837.

The spelling of 2991243 in words is "two million, nine hundred ninety-one thousand, two hundred forty-three".