4218382991 has 2 divisors, whose sum is σ = 4218382992. Its totient is φ = 4218382990.

The previous prime is 4218382969. The next prime is 4218382997. The reversal of 4218382991 is 1992838124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4218382991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4218382997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2109191495 + 2109191496.

It is an arithmetic number, because the mean of its divisors is an integer number (2109191496).

Almost surely, 2^4218382991 is an apocalyptic number.

4218382991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4218382991 is an equidigital number, since it uses as much as digits as its factorization.

4218382991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 47.

The square root of 4218382991 is about 64949.0799857858. The cubic root of 4218382991 is about 1615.7791600513.

The spelling of 4218382991 in words is "four billion, two hundred eighteen million, three hundred eighty-two thousand, nine hundred ninety-one".