198080861 has 8 divisors (see below), whose sum is σ = 218109024. Its totient is φ = 178389520.

The previous prime is 198080851. The next prime is 198080867. The reversal of 198080861 is 168080891.

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 198080861 - 2⁶ = 198080797 is a prime.

198080861 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198080867) 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, 82970 + ... + 85323.

It is an arithmetic number, because the mean of its divisors is an integer number (27263628).

Almost surely, 2^198080861 is an apocalyptic number.

198080861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

198080861 is a deficient number, since it is larger than the sum of its proper divisors (20028163).

198080861 is a wasteful number, since it uses less digits than its factorization.

198080861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168411.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 198080861 is about 14074.1202566981. The cubic root of 198080861 is about 582.9270003639.

The spelling of 198080861 in words is "one hundred ninety-eight million, eighty thousand, eight hundred sixty-one".