198234991 has 8 divisors (see below), whose sum is σ = 200134800. Its totient is φ = 196344192.

The previous prime is 198234979. The next prime is 198234997. The reversal of 198234991 is 199432891.

It is a happy number.

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 198234991 - 2¹³ = 198226799 is a prime.

It is a super-2 number, since 2×198234991² = 78594223313540162, 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 (198234997) 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, 46935 + ... + 50983.

It is an arithmetic number, because the mean of its divisors is an integer number (25016850).

Almost surely, 2^198234991 is an apocalyptic number.

198234991 is a deficient number, since it is larger than the sum of its proper divisors (1899809).

198234991 is a wasteful number, since it uses less digits than its factorization.

198234991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4505.

The product of its digits is 139968, while the sum is 46.

The square root of 198234991 is about 14079.5948450231. The cubic root of 198234991 is about 583.0781562176.

The spelling of 198234991 in words is "one hundred ninety-eight million, two hundred thirty-four thousand, nine hundred ninety-one".