197686945 has 4 divisors (see below), whose sum is σ = 237224340. Its totient is φ = 158149552.

The previous prime is 197686919. The next prime is 197686961. The reversal of 197686945 is 549686791.

197686945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 88943761 + 108743184 = 9431^2 + 10428^2 .

It is a cyclic number.

It is not a de Polignac number, because 197686945 - 2¹¹ = 197684897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19768690 + ... + 19768699.

It is an arithmetic number, because the mean of its divisors is an integer number (59306085).

Almost surely, 2^197686945 is an apocalyptic number.

It is an amenable number.

197686945 is a deficient number, since it is larger than the sum of its proper divisors (39537395).

197686945 is an equidigital number, since it uses as much as digits as its factorization.

197686945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39537394.

The product of its digits is 3265920, while the sum is 55.

The square root of 197686945 is about 14060.1189539776. The cubic root of 197686945 is about 582.5403288895.

The spelling of 197686945 in words is "one hundred ninety-seven million, six hundred eighty-six thousand, nine hundred forty-five".