197143111 has 4 divisors (see below), whose sum is σ = 215065224. Its totient is φ = 179221000.

The previous prime is 197143109. The next prime is 197143127. The reversal of 197143111 is 111341791.

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 197143111 - 2¹ = 197143109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197143111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197143151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8961040 + ... + 8961061.

It is an arithmetic number, because the mean of its divisors is an integer number (53766306).

Almost surely, 2^197143111 is an apocalyptic number.

197143111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

197143111 is a deficient number, since it is larger than the sum of its proper divisors (17922113).

197143111 is a wasteful number, since it uses less digits than its factorization.

197143111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17922112.

The product of its digits is 756, while the sum is 28.

The square root of 197143111 is about 14040.7660403555. The cubic root of 197143111 is about 582.0056515474.

The spelling of 197143111 in words is "one hundred ninety-seven million, one hundred forty-three thousand, one hundred eleven".