798818191 has 4 divisors (see below), whose sum is σ = 806727384. Its totient is φ = 790909000.

The previous prime is 798818179. The next prime is 798818203. The reversal of 798818191 is 191818897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191818897 = 101 ⋅1899197.

It is an interprime number because it is at equal distance from previous prime (798818179) and next prime (798818203).

It is a cyclic number.

It is not a de Polignac number, because 798818191 - 2²⁷ = 664600463 is a prime.

It is a super-2 number, since 2×798818191² = 1276221004545024962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (798818161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3954445 + ... + 3954646.

It is an arithmetic number, because the mean of its divisors is an integer number (201681846).

Almost surely, 2^798818191 is an apocalyptic number.

798818191 is a deficient number, since it is larger than the sum of its proper divisors (7909193).

798818191 is a wasteful number, since it uses less digits than its factorization.

798818191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7909192.

The product of its digits is 290304, while the sum is 52.

The square root of 798818191 is about 28263.3718972100. The cubic root of 798818191 is about 927.8604188196.

The spelling of 798818191 in words is "seven hundred ninety-eight million, eight hundred eighteen thousand, one hundred ninety-one".