197981093 has 2 divisors, whose sum is σ = 197981094. Its totient is φ = 197981092.

The previous prime is 197981081. The next prime is 197981107. The reversal of 197981093 is 390189791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188842564 + 9138529 = 13742^2 + 3023^2 .

It is a cyclic number.

It is not a de Polignac number, because 197981093 - 2⁸ = 197980837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197981053) 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, 98990546 + 98990547.

It is an arithmetic number, because the mean of its divisors is an integer number (98990547).

Almost surely, 2^197981093 is an apocalyptic number.

It is an amenable number.

197981093 is a deficient number, since it is larger than the sum of its proper divisors (1).

197981093 is an equidigital number, since it uses as much as digits as its factorization.

197981093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 197981093 is about 14070.5754324406. The cubic root of 197981093 is about 582.8291157129.

The spelling of 197981093 in words is "one hundred ninety-seven million, nine hundred eighty-one thousand, ninety-three".