2228991 has 16 divisors (see below), whose sum is σ = 3129984. Its totient is φ = 1409184.

The previous prime is 2228987. The next prime is 2229037. The reversal of 2228991 is 1998222.

It is a happy number.

2228991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2228991 - 2² = 2228987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2228971) 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 15 ways as a sum of consecutive naturals, for example, 4540 + ... + 5006.

It is an arithmetic number, because the mean of its divisors is an integer number (195624).

2^2228991 is an apocalyptic number.

2228991 is a deficient number, since it is larger than the sum of its proper divisors (900993).

2228991 is a wasteful number, since it uses less digits than its factorization.

2228991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550.

The product of its digits is 5184, while the sum is 33.

The square root of 2228991 is about 1492.9805758951. The cubic root of 2228991 is about 130.6279480879.

The spelling of 2228991 in words is "two million, two hundred twenty-eight thousand, nine hundred ninety-one".