2211490891 has 4 divisors (see below), whose sum is σ = 2211679800. Its totient is φ = 2211301984.

The previous prime is 2211490877. The next prime is 2211490901. The reversal of 2211490891 is 1980941122.

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 2211490891 - 2¹⁷ = 2211359819 is a prime.

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 2211490891.

It is not an unprimeable number, because it can be changed into a prime (2211490811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75646 + ... + 100723.

It is an arithmetic number, because the mean of its divisors is an integer number (552919950).

Almost surely, 2^2211490891 is an apocalyptic number.

2211490891 is a deficient number, since it is larger than the sum of its proper divisors (188909).

2211490891 is a wasteful number, since it uses less digits than its factorization.

2211490891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188908.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 2211490891 is about 47026.4913745433. The cubic root of 2211490891 is about 1302.8519029070.

The spelling of 2211490891 in words is "two billion, two hundred eleven million, four hundred ninety thousand, eight hundred ninety-one".