198403279491 has 8 divisors (see below), whose sum is σ = 269021396160. Its totient is φ = 130027007912.

The previous prime is 198403279463. The next prime is 198403279507. The reversal of 198403279491 is 194972304891.

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 198403279491 - 2¹⁸ = 198403017347 is a prime.

It is a super-2 number, since 2×198403279491² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (198403279421) 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, 560461065 + ... + 560461418.

It is an arithmetic number, because the mean of its divisors is an integer number (33627674520).

Almost surely, 2^198403279491 is an apocalyptic number.

198403279491 is a deficient number, since it is larger than the sum of its proper divisors (70618116669).

198403279491 is a wasteful number, since it uses less digits than its factorization.

198403279491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120922545.

The product of its (nonzero) digits is 3919104, while the sum is 57.

The spelling of 198403279491 in words is "one hundred ninety-eight billion, four hundred three million, two hundred seventy-nine thousand, four hundred ninety-one".