197878097 has 4 divisors (see below), whose sum is σ = 201611700. Its totient is φ = 194144496.

The previous prime is 197878091. The next prime is 197878123. The reversal of 197878097 is 790878791.

197878097 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, and also an emirpimes, since its reverse is a distinct semiprime: 790878791 = 2129 ⋅371479.

It can be written as a sum of positive squares in 2 ways, for example, as 177528976 + 20349121 = 13324^2 + 4511^2 .

It is a cyclic number.

It is not a de Polignac number, because 197878097 - 2²² = 193683793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197878091) 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, 1866722 + ... + 1866827.

It is an arithmetic number, because the mean of its divisors is an integer number (50402925).

Almost surely, 2^197878097 is an apocalyptic number.

It is an amenable number.

197878097 is a deficient number, since it is larger than the sum of its proper divisors (3733603).

197878097 is an equidigital number, since it uses as much as digits as its factorization.

197878097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3733602.

The product of its (nonzero) digits is 1778112, while the sum is 56.

The square root of 197878097 is about 14066.9149780611. The cubic root of 197878097 is about 582.7280294941.

The spelling of 197878097 in words is "one hundred ninety-seven million, eight hundred seventy-eight thousand, ninety-seven".