197975846389 has 2 divisors, whose sum is σ = 197975846390. Its totient is φ = 197975846388.

The previous prime is 197975846371. The next prime is 197975846399. The reversal of 197975846389 is 983648579791.

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., 138663140625 + 59312705764 = 372375^2 + 243542^2 .

It is a cyclic number.

It is not a de Polignac number, because 197975846389 - 2¹⁷ = 197975715317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197975846399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98987923194 + 98987923195.

It is an arithmetic number, because the mean of its divisors is an integer number (98987923195).

Almost surely, 2^197975846389 is an apocalyptic number.

It is an amenable number.

197975846389 is a deficient number, since it is larger than the sum of its proper divisors (1).

197975846389 is an equidigital number, since it uses as much as digits as its factorization.

197975846389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 823011840, while the sum is 76.

The spelling of 197975846389 in words is "one hundred ninety-seven billion, nine hundred seventy-five million, eight hundred forty-six thousand, three hundred eighty-nine".