197875817 has 2 divisors, whose sum is σ = 197875818. Its totient is φ = 197875816.

The previous prime is 197875789. The next prime is 197875819. The reversal of 197875817 is 718578791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163430656 + 34445161 = 12784^2 + 5869^2 .

It is a cyclic number.

It is not a de Polignac number, because 197875817 - 2¹⁴ = 197859433 is a prime.

Together with 197875819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197875819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98937908 + 98937909.

It is an arithmetic number, because the mean of its divisors is an integer number (98937909).

Almost surely, 2^197875817 is an apocalyptic number.

It is an amenable number.

197875817 is a deficient number, since it is larger than the sum of its proper divisors (1).

197875817 is an equidigital number, since it uses as much as digits as its factorization.

197875817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 987840, while the sum is 53.

The square root of 197875817 is about 14066.8339366042. The cubic root of 197875817 is about 582.7257913737.

The spelling of 197875817 in words is "one hundred ninety-seven million, eight hundred seventy-five thousand, eight hundred seventeen".