2243991 has 8 divisors (see below), whose sum is σ = 3095280. Its totient is φ = 1444352.

The previous prime is 2243987. The next prime is 2244091. The reversal of 2243991 is 1993422.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2243991 - 2² = 2243987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2243911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12810 + ... + 12983.

It is an arithmetic number, because the mean of its divisors is an integer number (386910).

2^2243991 is an apocalyptic number.

2243991 is a deficient number, since it is larger than the sum of its proper divisors (851289).

2243991 is a wasteful number, since it uses less digits than its factorization.

2243991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25825.

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

The square root of 2243991 is about 1497.9956608749. The cubic root of 2243991 is about 130.9203135984.

Adding to 2243991 its sum of digits (30), we get a triangular number (2244021 = T₂₁₁₈).

The spelling of 2243991 in words is "two million, two hundred forty-three thousand, nine hundred ninety-one".