4431399991 has 2 divisors, whose sum is σ = 4431399992. Its totient is φ = 4431399990.

The previous prime is 4431399983. The next prime is 4431400021. The reversal of 4431399991 is 1999931344.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4431399991 - 2³ = 4431399983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4431399901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2215699995 + 2215699996.

It is an arithmetic number, because the mean of its divisors is an integer number (2215699996).

Almost surely, 2^4431399991 is an apocalyptic number.

4431399991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4431399991 is an equidigital number, since it uses as much as digits as its factorization.

4431399991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 52.

The square root of 4431399991 is about 66568.7613749873. The cubic root of 4431399991 is about 1642.5312872173.

The spelling of 4431399991 in words is "four billion, four hundred thirty-one million, three hundred ninety-nine thousand, nine hundred ninety-one".