199998651 has 8 divisors (see below), whose sum is σ = 266872320. Its totient is φ = 133228712.

The previous prime is 199998649. The next prime is 199998661. The reversal of 199998651 is 156899991.

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 199998651 - 2¹ = 199998649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199998591 and 199998600.

It is not an unprimeable number, because it can be changed into a prime (199998661) 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, 21315 + ... + 29228.

It is an arithmetic number, because the mean of its divisors is an integer number (33359040).

Almost surely, 2^199998651 is an apocalyptic number.

199998651 is a deficient number, since it is larger than the sum of its proper divisors (66873669).

199998651 is a wasteful number, since it uses less digits than its factorization.

199998651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51865.

The product of its digits is 1574640, while the sum is 57.

The square root of 199998651 is about 14142.0879292981. The cubic root of 199998651 is about 584.8022328063.

The spelling of 199998651 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, six hundred fifty-one".