198500431 has 4 divisors (see below), whose sum is σ = 201463192. Its totient is φ = 195537672.

The previous prime is 198500417. The next prime is 198500441. The reversal of 198500431 is 134005891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134005891 = 101 ⋅1326791.

It is a cyclic number.

It is not a de Polignac number, because 198500431 - 2⁷ = 198500303 is a prime.

It is a super-2 number, since 2×198500431² = 78804842214371522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198500393 and 198500402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198500441) 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, 1481280 + ... + 1481413.

It is an arithmetic number, because the mean of its divisors is an integer number (50365798).

Almost surely, 2^198500431 is an apocalyptic number.

198500431 is a deficient number, since it is larger than the sum of its proper divisors (2962761).

198500431 is an equidigital number, since it uses as much as digits as its factorization.

198500431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2962760.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 198500431 is about 14089.0180992147. The cubic root of 198500431 is about 583.3382906427.

The spelling of 198500431 in words is "one hundred ninety-eight million, five hundred thousand, four hundred thirty-one".