997819219 has 8 divisors (see below), whose sum is σ = 1078724240. Its totient is φ = 919753056.

The previous prime is 997819213. The next prime is 997819223. The reversal of 997819219 is 912918799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 997819219 - 2⁹ = 997818707 is a prime.

It is a super-2 number, since 2×997819219² = 1991286387611539922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 997819219.

It is not an unprimeable number, because it can be changed into a prime (997819213) 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 7 ways as a sum of consecutive naturals, for example, 708984 + ... + 710389.

It is an arithmetic number, because the mean of its divisors is an integer number (134840530).

Almost surely, 2^997819219 is an apocalyptic number.

997819219 is the 18238-th hex number.

997819219 is a deficient number, since it is larger than the sum of its proper divisors (80905021).

997819219 is a wasteful number, since it uses less digits than its factorization.

997819219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419429.

The product of its digits is 734832, while the sum is 55.

The square root of 997819219 is about 31588.2766069946. The cubic root of 997819219 is about 999.2725439360.

The spelling of 997819219 in words is "nine hundred ninety-seven million, eight hundred nineteen thousand, two hundred nineteen".