9139221 has 24 divisors (see below), whose sum is σ = 16248960. Its totient is φ = 4820256.

The previous prime is 9139219. The next prime is 9139231. The reversal of 9139221 is 1229319.

It is not a de Polignac number, because 9139221 - 2¹ = 9139219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9139201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4761 + ... + 6398.

It is an arithmetic number, because the mean of its divisors is an integer number (677040).

Almost surely, 2^9139221 is an apocalyptic number.

9139221 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

9139221 is a deficient number, since it is larger than the sum of its proper divisors (7109739).

9139221 is a wasteful number, since it uses less digits than its factorization.

9139221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11185 (or 11182 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 9139221 is about 3023.1144536719. The cubic root of 9139221 is about 209.0754594244.

The spelling of 9139221 in words is "nine million, one hundred thirty-nine thousand, two hundred twenty-one".