2191422991 has 2 divisors, whose sum is σ = 2191422992. Its totient is φ = 2191422990.

The previous prime is 2191422977. The next prime is 2191423009. The reversal of 2191422991 is 1992241912.

2191422991 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 2191422991 - 2²¹ = 2189325839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2191422901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095711495 + 1095711496.

It is an arithmetic number, because the mean of its divisors is an integer number (1095711496).

Almost surely, 2^2191422991 is an apocalyptic number.

2191422991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191422991 is an equidigital number, since it uses as much as digits as its factorization.

2191422991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 40.

The square root of 2191422991 is about 46812.6370865817. The cubic root of 2191422991 is about 1298.8990661378.

The spelling of 2191422991 in words is "two billion, one hundred ninety-one million, four hundred twenty-two thousand, nine hundred ninety-one".