9665213 has 4 divisors (see below), whose sum is σ = 9735900. Its totient is φ = 9594528.

The previous prime is 9665209. The next prime is 9665269. The reversal of 9665213 is 3125669.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8082649 + 1582564 = 2843^2 + 1258^2 .

It is a cyclic number.

It is not a de Polignac number, because 9665213 - 2² = 9665209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9665213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9665113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35138 + ... + 35411.

It is an arithmetic number, because the mean of its divisors is an integer number (2433975).

Almost surely, 2^9665213 is an apocalyptic number.

It is an amenable number.

9665213 is a deficient number, since it is larger than the sum of its proper divisors (70687).

9665213 is a wasteful number, since it uses less digits than its factorization.

9665213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70686.

The product of its digits is 9720, while the sum is 32.

The square root of 9665213 is about 3108.8925681020. The cubic root of 9665213 is about 213.0118723499.

The spelling of 9665213 in words is "nine million, six hundred sixty-five thousand, two hundred thirteen".