4406001991 has 2 divisors, whose sum is σ = 4406001992. Its totient is φ = 4406001990.

The previous prime is 4406001973. The next prime is 4406002019. The reversal of 4406001991 is 1991006044.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4406001991 - 2⁷ = 4406001863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4406071991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2203000995 + 2203000996.

It is an arithmetic number, because the mean of its divisors is an integer number (2203000996).

Almost surely, 2^4406001991 is an apocalyptic number.

4406001991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4406001991 is an equidigital number, since it uses as much as digits as its factorization.

4406001991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 4406001991 is about 66377.7220986078. The cubic root of 4406001991 is about 1639.3872873512.

The spelling of 4406001991 in words is "four billion, four hundred six million, one thousand, nine hundred ninety-one".