2211000991 has 2 divisors, whose sum is σ = 2211000992. Its totient is φ = 2211000990.

The previous prime is 2211000983. The next prime is 2211000997. The reversal of 2211000991 is 1990001122.

2211000991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2211000991 - 2³ = 2211000983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211000997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105500495 + 1105500496.

It is an arithmetic number, because the mean of its divisors is an integer number (1105500496).

Almost surely, 2^2211000991 is an apocalyptic number.

2211000991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211000991 is an equidigital number, since it uses as much as digits as its factorization.

2211000991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 2211000991 is about 47021.2823198177. The cubic root of 2211000991 is about 1302.7556911484.

The spelling of 2211000991 in words is "two billion, two hundred eleven million, nine hundred ninety-one", and thus it is an aban number.