197145899 has 4 divisors (see below), whose sum is σ = 197348664. Its totient is φ = 196943136.

The previous prime is 197145887. The next prime is 197145931. The reversal of 197145899 is 998541791.

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 197145899 - 2⁸ = 197145643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197145899.

It is not an unprimeable number, because it can be changed into a prime (197145859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99917 + ... + 101870.

It is an arithmetic number, because the mean of its divisors is an integer number (49337166).

Almost surely, 2^197145899 is an apocalyptic number.

197145899 is a deficient number, since it is larger than the sum of its proper divisors (202765).

197145899 is an equidigital number, since it uses as much as digits as its factorization.

197145899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202764.

The product of its digits is 816480, while the sum is 53.

The square root of 197145899 is about 14040.8653223368. The cubic root of 197145899 is about 582.0083951112.

The spelling of 197145899 in words is "one hundred ninety-seven million, one hundred forty-five thousand, eight hundred ninety-nine".