2191911347 has 2 divisors, whose sum is σ = 2191911348. Its totient is φ = 2191911346.

The previous prime is 2191911341. The next prime is 2191911349. The reversal of 2191911347 is 7431191912.

2191911347 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 2191911347 - 2⁸ = 2191911091 is a prime.

Together with 2191911349, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2191911347.

It is not a weakly prime, because it can be changed into another prime (2191911341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095955673 + 1095955674.

It is an arithmetic number, because the mean of its divisors is an integer number (1095955674).

Almost surely, 2^2191911347 is an apocalyptic number.

2191911347 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191911347 is an equidigital number, since it uses as much as digits as its factorization.

2191911347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 38.

The square root of 2191911347 is about 46817.8528661877. The cubic root of 2191911347 is about 1298.9955450073.

The spelling of 2191911347 in words is "two billion, one hundred ninety-one million, nine hundred eleven thousand, three hundred forty-seven".