4446001991 has 2 divisors, whose sum is σ = 4446001992. Its totient is φ = 4446001990.

The previous prime is 4446001949. The next prime is 4446001997. The reversal of 4446001991 is 1991006444.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4446001991 - 2¹⁰ = 4446000967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4446001997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2223000995 + 2223000996.

It is an arithmetic number, because the mean of its divisors is an integer number (2223000996).

Almost surely, 2^4446001991 is an apocalyptic number.

4446001991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4446001991 is an equidigital number, since it uses as much as digits as its factorization.

4446001991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 4446001991 is about 66678.3472425644. The cubic root of 4446001991 is about 1644.3334224615. Note that the first 3 decimals are identical.

The spelling of 4446001991 in words is "four billion, four hundred forty-six million, one thousand, nine hundred ninety-one".