198597397 has 2 divisors, whose sum is σ = 198597398. Its totient is φ = 198597396.

The previous prime is 198597361. The next prime is 198597401. The reversal of 198597397 is 793795891.

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., 156100036 + 42497361 = 12494^2 + 6519^2 .

It is a cyclic number.

It is not a de Polignac number, because 198597397 - 2¹⁵ = 198564629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198597097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99298698 + 99298699.

It is an arithmetic number, because the mean of its divisors is an integer number (99298699).

Almost surely, 2^198597397 is an apocalyptic number.

It is an amenable number.

198597397 is a deficient number, since it is larger than the sum of its proper divisors (1).

198597397 is an equidigital number, since it uses as much as digits as its factorization.

198597397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4286520, while the sum is 58.

The square root of 198597397 is about 14092.4588699063. The cubic root of 198597397 is about 583.4332606679.

The spelling of 198597397 in words is "one hundred ninety-eight million, five hundred ninety-seven thousand, three hundred ninety-seven".