97943209 has 12 divisors (see below), whose sum is σ = 122698884. Its totient is φ = 77493024.

The previous prime is 97943201. The next prime is 97943227. The reversal of 97943209 is 90234979.

It can be written as a sum of positive squares in 2 ways, for example, as 50979600 + 46963609 = 7140^2 + 6853^2 .

It is not a de Polignac number, because 97943209 - 2³ = 97943201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (97943201) 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 in 11 ways as a sum of consecutive naturals, for example, 76242 + ... + 77515.

It is an arithmetic number, because the mean of its divisors is an integer number (10224907).

Almost surely, 2^97943209 is an apocalyptic number.

It is an amenable number.

97943209 is a deficient number, since it is larger than the sum of its proper divisors (24755675).

97943209 is a wasteful number, since it uses less digits than its factorization.

97943209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153784 (or 153777 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 97943209 is about 9896.6261422770. The cubic root of 97943209 is about 460.9545537362.

The spelling of 97943209 in words is "ninety-seven million, nine hundred forty-three thousand, two hundred nine".