4911791891 has 2 divisors, whose sum is σ = 4911791892. Its totient is φ = 4911791890.

The previous prime is 4911791881. The next prime is 4911791893. The reversal of 4911791891 is 1981971194.

It is a happy number.

4911791891 is digitally balanced in base 3, 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 4911791891 - 2²⁶ = 4844683027 is a prime.

Together with 4911791893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4911791893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2455895945 + 2455895946.

It is an arithmetic number, because the mean of its divisors is an integer number (2455895946).

Almost surely, 2^4911791891 is an apocalyptic number.

4911791891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4911791891 is an equidigital number, since it uses as much as digits as its factorization.

4911791891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 50.

The square root of 4911791891 is about 70084.1771800169. The cubic root of 4911791891 is about 1699.8606449783.

The spelling of 4911791891 in words is "four billion, nine hundred eleven million, seven hundred ninety-one thousand, eight hundred ninety-one".