197288257 has 4 divisors (see below), whose sum is σ = 201876400. Its totient is φ = 192700116.

The previous prime is 197288243. The next prime is 197288263. The reversal of 197288257 is 752882791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 197288257 - 2¹⁵ = 197255489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197288257.

It is not an unprimeable number, because it can be changed into a prime (197288297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2294007 + ... + 2294092.

It is an arithmetic number, because the mean of its divisors is an integer number (50469100).

Almost surely, 2^197288257 is an apocalyptic number.

It is an amenable number.

197288257 is a deficient number, since it is larger than the sum of its proper divisors (4588143).

197288257 is an equidigital number, since it uses as much as digits as its factorization.

197288257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4588142.

The product of its digits is 564480, while the sum is 49.

The square root of 197288257 is about 14045.9338244205. The cubic root of 197288257 is about 582.1484497895.

The spelling of 197288257 in words is "one hundred ninety-seven million, two hundred eighty-eight thousand, two hundred fifty-seven".