198651 has 8 divisors (see below), whose sum is σ = 276480. Its totient is φ = 126632.

The previous prime is 198647. The next prime is 198659. The reversal of 198651 is 156891.

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 198651 - 2² = 198647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1371 + ... + 1508.

It is an arithmetic number, because the mean of its divisors is an integer number (34560).

2¹⁹⁸⁶⁵¹ is an apocalyptic number.

198651 is a deficient number, since it is larger than the sum of its proper divisors (77829).

198651 is a wasteful number, since it uses less digits than its factorization.

198651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2905.

The product of its digits is 2160, while the sum is 30.

The square root of 198651 is about 445.7028157865. The cubic root of 198651 is about 58.3485747022.

The spelling of 198651 in words is "one hundred ninety-eight thousand, six hundred fifty-one".