2216491691 has 2 divisors, whose sum is σ = 2216491692. Its totient is φ = 2216491690.

The previous prime is 2216491681. The next prime is 2216491733. The reversal of 2216491691 is 1961946122.

2216491691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2216491691 - 2¹⁰ = 2216490667 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2216491601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108245845 + 1108245846.

It is an arithmetic number, because the mean of its divisors is an integer number (1108245846).

Almost surely, 2^2216491691 is an apocalyptic number.

2216491691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2216491691 is an equidigital number, since it uses as much as digits as its factorization.

2216491691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 2216491691 is about 47079.6313813097. The cubic root of 2216491691 is about 1303.8332012413.

The spelling of 2216491691 in words is "two billion, two hundred sixteen million, four hundred ninety-one thousand, six hundred ninety-one".