198720511 has 8 divisors (see below), whose sum is σ = 217529424. Its totient is φ = 180035520.

The previous prime is 198720491. The next prime is 198720541. The reversal of 198720511 is 115027891.

It is a happy number.

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 198720511 - 2²³ = 190331903 is a prime.

It is a super-2 number, since 2×198720511² = 78979682984202242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198720541) 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, 27606 + ... + 34051.

It is an arithmetic number, because the mean of its divisors is an integer number (27191178).

Almost surely, 2^198720511 is an apocalyptic number.

198720511 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

198720511 is a deficient number, since it is larger than the sum of its proper divisors (18808913).

198720511 is a wasteful number, since it uses less digits than its factorization.

198720511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61961.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 198720511 is about 14096.8262740235. The cubic root of 198720511 is about 583.5537959250.

The spelling of 198720511 in words is "one hundred ninety-eight million, seven hundred twenty thousand, five hundred eleven".