9217213 has 4 divisors (see below), whose sum is σ = 9759420. Its totient is φ = 8675008.

The previous prime is 9217211. The next prime is 9217237. The reversal of 9217213 is 3127129.

9217213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 8191044 + 1026169 = 2862^2 + 1013^2 .

It is a cyclic number.

It is not a de Polignac number, because 9217213 - 2¹ = 9217211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9217211) 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, 271078 + ... + 271111.

It is an arithmetic number, because the mean of its divisors is an integer number (2439855).

Almost surely, 2^9217213 is an apocalyptic number.

It is an amenable number.

9217213 is a deficient number, since it is larger than the sum of its proper divisors (542207).

9217213 is a wasteful number, since it uses less digits than its factorization.

9217213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542206.

The product of its digits is 756, while the sum is 25.

The square root of 9217213 is about 3035.9863306675. The cubic root of 9217213 is about 209.6685095108.

The spelling of 9217213 in words is "nine million, two hundred seventeen thousand, two hundred thirteen".