198781801 has 9 divisors (see below), whose sum is σ = 208139799. Its totient is φ = 189828936.

The previous prime is 198781789. The next prime is 198781813. The reversal of 198781801 is 108187891.

The square root of 198781801 is 14099.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (198781789) and next prime (198781813).

It can be written as a sum of positive squares in only one way, i.e., 648025 + 198133776 = 805^2 + 14076^2 .

It is not a de Polignac number, because 198781801 - 2⁵ = 198781769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198781601) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 323971 + ... + 324583.

Almost surely, 2^198781801 is an apocalyptic number.

198781801 is the 14099-th square number.

198781801 is the 7050-th centered octagonal number.

It is an amenable number.

198781801 is a deficient number, since it is larger than the sum of its proper divisors (9357998).

198781801 is an frugal number, since it uses more digits than its factorization.

198781801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 43.

The cubic root of 198781801 is about 583.6137835857.

The spelling of 198781801 in words is "one hundred ninety-eight million, seven hundred eighty-one thousand, eight hundred one".