3991219459 has 4 divisors (see below), whose sum is σ = 3992023816. Its totient is φ = 3990415104.

The previous prime is 3991219429. The next prime is 3991219471. The reversal of 3991219459 is 9549121993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3991219459 - 2¹³ = 3991211267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3991219429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394689 + ... + 404674.

It is an arithmetic number, because the mean of its divisors is an integer number (998005954).

Almost surely, 2^3991219459 is an apocalyptic number.

3991219459 is a deficient number, since it is larger than the sum of its proper divisors (804357).

3991219459 is an equidigital number, since it uses as much as digits as its factorization.

3991219459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804356.

The product of its digits is 787320, while the sum is 52.

The square root of 3991219459 is about 63176.0987953514. The cubic root of 3991219459 is about 1586.2386810307.

The spelling of 3991219459 in words is "three billion, nine hundred ninety-one million, two hundred nineteen thousand, four hundred fifty-nine".