198520311 has 16 divisors (see below), whose sum is σ = 298073088. Its totient is φ = 116433600.

The previous prime is 198520307. The next prime is 198520327. The reversal of 198520311 is 113025891.

It is not a de Polignac number, because 198520311 - 2² = 198520307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198520381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96006 + ... + 98051.

It is an arithmetic number, because the mean of its divisors is an integer number (18629568).

Almost surely, 2^198520311 is an apocalyptic number.

198520311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

198520311 is a deficient number, since it is larger than the sum of its proper divisors (99552777).

198520311 is a wasteful number, since it uses less digits than its factorization.

198520311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194102.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 198520311 is about 14089.7235955855. The cubic root of 198520311 is about 583.3577639473.

The spelling of 198520311 in words is "one hundred ninety-eight million, five hundred twenty thousand, three hundred eleven".