2228668991 has 4 divisors (see below), whose sum is σ = 2238401400. Its totient is φ = 2218936584.

The previous prime is 2228668987. The next prime is 2228669057. The reversal of 2228668991 is 1998668222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1998668222 = 2 ⋅999334111.

It is a cyclic number.

It is not a de Polignac number, because 2228668991 - 2² = 2228668987 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 (2228668901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4865861 + ... + 4866318.

It is an arithmetic number, because the mean of its divisors is an integer number (559600350).

Almost surely, 2^2228668991 is an apocalyptic number.

2228668991 is a deficient number, since it is larger than the sum of its proper divisors (9732409).

2228668991 is an equidigital number, since it uses as much as digits as its factorization.

2228668991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9732408.

The product of its digits is 1492992, while the sum is 53.

The square root of 2228668991 is about 47208.7808675462. The cubic root of 2228668991 is about 1306.2165743879.

The spelling of 2228668991 in words is "two billion, two hundred twenty-eight million, six hundred sixty-eight thousand, nine hundred ninety-one".