998147191 has 4 divisors (see below), whose sum is σ = 1015065000. Its totient is φ = 981229384.

The previous prime is 998147167. The next prime is 998147203. The reversal of 998147191 is 191741899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191741899 = 809 ⋅237011.

It is a cyclic number.

It is not a de Polignac number, because 998147191 - 2¹⁷ = 998016119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998147291) 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 in 3 ways as a sum of consecutive naturals, for example, 8458816 + ... + 8458933.

It is an arithmetic number, because the mean of its divisors is an integer number (253766250).

Almost surely, 2^998147191 is an apocalyptic number.

998147191 is a deficient number, since it is larger than the sum of its proper divisors (16917809).

998147191 is a wasteful number, since it uses less digits than its factorization.

998147191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16917808.

The product of its digits is 163296, while the sum is 49.

The square root of 998147191 is about 31593.4675368184. The cubic root of 998147191 is about 999.3820151734.

The spelling of 998147191 in words is "nine hundred ninety-eight million, one hundred forty-seven thousand, one hundred ninety-one".