1997598347 has 2 divisors, whose sum is σ = 1997598348. Its totient is φ = 1997598346.

The previous prime is 1997598331. The next prime is 1997598349. The reversal of 1997598347 is 7438957991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1997598347 - 2⁴ = 1997598331 is a prime.

Together with 1997598349, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1997598347.

It is not a weakly prime, because it can be changed into another prime (1997598349) 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, 998799173 + 998799174.

It is an arithmetic number, because the mean of its divisors is an integer number (998799174).

Almost surely, 2^1997598347 is an apocalyptic number.

1997598347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997598347 is an equidigital number, since it uses as much as digits as its factorization.

1997598347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17146080, while the sum is 62.

The square root of 1997598347 is about 44694.5001873832. The cubic root of 1997598347 is about 1259.4165323667.

The spelling of 1997598347 in words is "one billion, nine hundred ninety-seven million, five hundred ninety-eight thousand, three hundred forty-seven".