198431851 has 8 divisors (see below), whose sum is σ = 203990384. Its totient is φ = 192883680.

The previous prime is 198431843. The next prime is 198431861. The reversal of 198431851 is 158134891.

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 198431851 - 2³ = 198431843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198431861) 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, 51916 + ... + 55606.

It is an arithmetic number, because the mean of its divisors is an integer number (25498798).

Almost surely, 2^198431851 is an apocalyptic number.

198431851 is a deficient number, since it is larger than the sum of its proper divisors (5558533).

198431851 is a wasteful number, since it uses less digits than its factorization.

198431851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5181.

The product of its digits is 34560, while the sum is 40.

The square root of 198431851 is about 14086.5840784769. The cubic root of 198431851 is about 583.2711036382.

The spelling of 198431851 in words is "one hundred ninety-eight million, four hundred thirty-one thousand, eight hundred fifty-one".