4449889991 has 2 divisors, whose sum is σ = 4449889992. Its totient is φ = 4449889990.

The previous prime is 4449889967. The next prime is 4449889993. The reversal of 4449889991 is 1999889444.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4449889991 is a prime.

Together with 4449889993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4449889993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2224944995 + 2224944996.

It is an arithmetic number, because the mean of its divisors is an integer number (2224944996).

Almost surely, 2^4449889991 is an apocalyptic number.

4449889991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4449889991 is an equidigital number, since it uses as much as digits as its factorization.

4449889991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26873856, while the sum is 65.

The square root of 4449889991 is about 66707.4957632199. The cubic root of 4449889991 is about 1644.8126024581.

The spelling of 4449889991 in words is "four billion, four hundred forty-nine million, eight hundred eighty-nine thousand, nine hundred ninety-one".