197139889 has 2 divisors, whose sum is σ = 197139890. Its totient is φ = 197139888.

The previous prime is 197139853. The next prime is 197139911. The reversal of 197139889 is 988931791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184416400 + 12723489 = 13580^2 + 3567^2 .

It is a cyclic number.

It is not a de Polignac number, because 197139889 - 2⁹ = 197139377 is a prime.

It is not a weakly prime, because it can be changed into another prime (197139809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98569944 + 98569945.

It is an arithmetic number, because the mean of its divisors is an integer number (98569945).

Almost surely, 2^197139889 is an apocalyptic number.

It is an amenable number.

197139889 is a deficient number, since it is larger than the sum of its proper divisors (1).

197139889 is an equidigital number, since it uses as much as digits as its factorization.

197139889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 55.

The square root of 197139889 is about 14040.6513025572. The cubic root of 197139889 is about 582.0024808686.

The spelling of 197139889 in words is "one hundred ninety-seven million, one hundred thirty-nine thousand, eight hundred eighty-nine".