4000219991 has 2 divisors, whose sum is σ = 4000219992. Its totient is φ = 4000219990.

The previous prime is 4000219987. The next prime is 4000220033. The reversal of 4000219991 is 1999120004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4000219991 - 2² = 4000219987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4000216991) 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, 2000109995 + 2000109996.

It is an arithmetic number, because the mean of its divisors is an integer number (2000109996).

Almost surely, 2^4000219991 is an apocalyptic number.

4000219991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000219991 is an equidigital number, since it uses as much as digits as its factorization.

4000219991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 4000219991 is about 63247.2923610173. The cubic root of 4000219991 is about 1587.4301525968.

Adding to 4000219991 its reverse (1999120004), we get a palindrome (5999339995).

The spelling of 4000219991 in words is "four billion, two hundred nineteen thousand, nine hundred ninety-one".