198129811 has 16 divisors (see below), whose sum is σ = 220824288. Its totient is φ = 176256000.

The previous prime is 198129809. The next prime is 198129817. The reversal of 198129811 is 118921891.

It is a cyclic number.

It is not a de Polignac number, because 198129811 - 2¹ = 198129809 is a prime.

It is a super-3 number, since 3×198129811³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198129817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109111 + ... + 110911.

It is an arithmetic number, because the mean of its divisors is an integer number (13801518).

Almost surely, 2^198129811 is an apocalyptic number.

198129811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

198129811 is a deficient number, since it is larger than the sum of its proper divisors (22694477).

198129811 is a wasteful number, since it uses less digits than its factorization.

198129811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022.

The product of its digits is 10368, while the sum is 40.

The square root of 198129811 is about 14075.8591567265. The cubic root of 198129811 is about 582.9750143019.

The spelling of 198129811 in words is "one hundred ninety-eight million, one hundred twenty-nine thousand, eight hundred eleven".