97797209 has 8 divisors (see below), whose sum is σ = 103668840. Its totient is φ = 91938816.

The previous prime is 97797197. The next prime is 97797233. The reversal of 97797209 is 90279779.

It can be written as a sum of positive squares in 4 ways, for example, as 37393225 + 60403984 = 6115^2 + 7772^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97797209 - 2²⁰ = 96748633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (97797289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14777 + ... + 20345.

It is an arithmetic number, because the mean of its divisors is an integer number (12958605).

Almost surely, 2^97797209 is an apocalyptic number.

It is an amenable number.

97797209 is a deficient number, since it is larger than the sum of its proper divisors (5871631).

97797209 is a wasteful number, since it uses less digits than its factorization.

97797209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6619.

The product of its (nonzero) digits is 500094, while the sum is 50.

The square root of 97797209 is about 9889.2471402023. The cubic root of 97797209 is about 460.7253976997.

The spelling of 97797209 in words is "ninety-seven million, seven hundred ninety-seven thousand, two hundred nine".