197789246917 has 2 divisors, whose sum is σ = 197789246918. Its totient is φ = 197789246916.

The previous prime is 197789246873. The next prime is 197789246929. The reversal of 197789246917 is 719642987791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124760129796 + 73029117121 = 353214^2 + 270239^2 .

It is a cyclic number.

It is not a de Polignac number, because 197789246917 - 2²³ = 197780858309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197789246987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98894623458 + 98894623459.

It is an arithmetic number, because the mean of its divisors is an integer number (98894623459).

Almost surely, 2^197789246917 is an apocalyptic number.

It is an amenable number.

197789246917 is a deficient number, since it is larger than the sum of its proper divisors (1).

197789246917 is an equidigital number, since it uses as much as digits as its factorization.

197789246917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96018048, while the sum is 70.

The spelling of 197789246917 in words is "one hundred ninety-seven billion, seven hundred eighty-nine million, two hundred forty-six thousand, nine hundred seventeen".