198851651 has 4 divisors (see below), whose sum is σ = 203476152. Its totient is φ = 194227152.

The previous prime is 198851641. The next prime is 198851657. The reversal of 198851651 is 156158891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198851651 - 2¹⁰ = 198850627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198851657) 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, 2312186 + ... + 2312271.

It is an arithmetic number, because the mean of its divisors is an integer number (50869038).

Almost surely, 2^198851651 is an apocalyptic number.

198851651 is a deficient number, since it is larger than the sum of its proper divisors (4624501).

198851651 is an equidigital number, since it uses as much as digits as its factorization.

198851651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624500.

The product of its digits is 86400, while the sum is 44.

The square root of 198851651 is about 14101.4769084660. The cubic root of 198851651 is about 583.6821343245.

The spelling of 198851651 in words is "one hundred ninety-eight million, eight hundred fifty-one thousand, six hundred fifty-one".