197047817 has 2 divisors, whose sum is σ = 197047818. Its totient is φ = 197047816.

The previous prime is 197047793. The next prime is 197047819. The reversal of 197047817 is 718740791.

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., 190550416 + 6497401 = 13804^2 + 2549^2 .

It is a cyclic number.

It is not a de Polignac number, because 197047817 - 2²⁶ = 129938953 is a prime.

Together with 197047819, 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 (197047819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98523908 + 98523909.

It is an arithmetic number, because the mean of its divisors is an integer number (98523909).

Almost surely, 2^197047817 is an apocalyptic number.

It is an amenable number.

197047817 is a deficient number, since it is larger than the sum of its proper divisors (1).

197047817 is an equidigital number, since it uses as much as digits as its factorization.

197047817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 44.

The square root of 197047817 is about 14037.3721543599. The cubic root of 197047817 is about 581.9118608236.

The spelling of 197047817 in words is "one hundred ninety-seven million, forty-seven thousand, eight hundred seventeen".