197995291 has 4 divisors (see below), whose sum is σ = 213225712. Its totient is φ = 182764872.

The previous prime is 197995289. The next prime is 197995307. The reversal of 197995291 is 192599791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192599791 = 10289 ⋅18719.

It is a cyclic number.

It is not a de Polignac number, because 197995291 - 2¹ = 197995289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197995211) 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, 7615191 + ... + 7615216.

It is an arithmetic number, because the mean of its divisors is an integer number (53306428).

Almost surely, 2^197995291 is an apocalyptic number.

197995291 is a deficient number, since it is larger than the sum of its proper divisors (15230421).

197995291 is a wasteful number, since it uses less digits than its factorization.

197995291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15230420.

The product of its digits is 459270, while the sum is 52.

The square root of 197995291 is about 14071.0799514465. The cubic root of 197995291 is about 582.8430476998.

The spelling of 197995291 in words is "one hundred ninety-seven million, nine hundred ninety-five thousand, two hundred ninety-one".