198816261 has 8 divisors (see below), whose sum is σ = 302958144. Its totient is φ = 113609280.

The previous prime is 198816239. The next prime is 198816329. The reversal of 198816261 is 162618891.

198816261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198816261 - 2⁵ = 198816229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198816161) 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, 4733700 + ... + 4733741.

It is an arithmetic number, because the mean of its divisors is an integer number (37869768).

Almost surely, 2^198816261 is an apocalyptic number.

It is an amenable number.

198816261 is a deficient number, since it is larger than the sum of its proper divisors (104141883).

198816261 is an equidigital number, since it uses as much as digits as its factorization.

198816261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9467451.

The product of its digits is 41472, while the sum is 42.

The square root of 198816261 is about 14100.2220195286. Note that the first 3 decimals coincide. The cubic root of 198816261 is about 583.6475059366.

The spelling of 198816261 in words is "one hundred ninety-eight million, eight hundred sixteen thousand, two hundred sixty-one".