9257221 has 4 divisors (see below), whose sum is σ = 9319500. Its totient is φ = 9194944.

The previous prime is 9257219. The next prime is 9257233. The reversal of 9257221 is 1227529.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1227529 = 541 ⋅2269.

It can be written as a sum of positive squares in 2 ways, for example, as 5313025 + 3944196 = 2305^2 + 1986^2 .

It is a cyclic number.

It is not a de Polignac number, because 9257221 - 2¹ = 9257219 is a prime.

It is a super-3 number, since 3×9257221³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 9257221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9257291) 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, 30916 + ... + 31213.

It is an arithmetic number, because the mean of its divisors is an integer number (2329875).

Almost surely, 2^9257221 is an apocalyptic number.

It is an amenable number.

9257221 is a deficient number, since it is larger than the sum of its proper divisors (62279).

9257221 is a wasteful number, since it uses less digits than its factorization.

9257221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62278.

The product of its digits is 2520, while the sum is 28.

The square root of 9257221 is about 3042.5681586449. The cubic root of 9257221 is about 209.9714322439.

The spelling of 9257221 in words is "nine million, two hundred fifty-seven thousand, two hundred twenty-one".