4821999991 has 2 divisors, whose sum is σ = 4821999992. Its totient is φ = 4821999990.

The previous prime is 4821999989. The next prime is 4822000013. The reversal of 4821999991 is 1999991284.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4821999991 - 2¹ = 4821999989 is a prime.

Together with 4821999989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4821991991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2410999995 + 2410999996.

It is an arithmetic number, because the mean of its divisors is an integer number (2410999996).

Almost surely, 2^4821999991 is an apocalyptic number.

4821999991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4821999991 is an equidigital number, since it uses as much as digits as its factorization.

4821999991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3779136, while the sum is 61.

The square root of 4821999991 is about 69440.6220522253. The cubic root of 4821999991 is about 1689.4385575930.

The spelling of 4821999991 in words is "four billion, eight hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred ninety-one".