197649899 has 4 divisors (see below), whose sum is σ = 201855264. Its totient is φ = 193444536.

The previous prime is 197649883. The next prime is 197649901. The reversal of 197649899 is 998946791.

It is a happy number.

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 197649899 - 2⁴ = 197649883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197649839) 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 3 ways as a sum of consecutive naturals, for example, 2102612 + ... + 2102705.

It is an arithmetic number, because the mean of its divisors is an integer number (50463816).

Almost surely, 2^197649899 is an apocalyptic number.

197649899 is a deficient number, since it is larger than the sum of its proper divisors (4205365).

197649899 is an equidigital number, since it uses as much as digits as its factorization.

197649899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4205364.

The product of its digits is 8817984, while the sum is 62.

The square root of 197649899 is about 14058.8014780777. The cubic root of 197649899 is about 582.5039377877.

The spelling of 197649899 in words is "one hundred ninety-seven million, six hundred forty-nine thousand, eight hundred ninety-nine".