198137911 has 4 divisors (see below), whose sum is σ = 199955800. Its totient is φ = 196320024.

The previous prime is 198137897. The next prime is 198137917. The reversal of 198137911 is 119731891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198137911 - 2¹³ = 198129719 is a prime.

It is a super-3 number, since 3×198137911³ (a number of 26 digits) contains 333 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 (198137917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908781 + ... + 908998.

It is an arithmetic number, because the mean of its divisors is an integer number (49988950).

Almost surely, 2^198137911 is an apocalyptic number.

198137911 is a deficient number, since it is larger than the sum of its proper divisors (1817889).

198137911 is a wasteful number, since it uses less digits than its factorization.

198137911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817888.

The product of its digits is 13608, while the sum is 40.

The square root of 198137911 is about 14076.1468804499. The cubic root of 198137911 is about 582.9829586444.

The spelling of 198137911 in words is "one hundred ninety-eight million, one hundred thirty-seven thousand, nine hundred eleven".