9221781 has 8 divisors (see below), whose sum is σ = 12830400. Its totient is φ = 5880512.

The previous prime is 9221777. The next prime is 9221789. The reversal of 9221781 is 1871229.

9221781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 9221781 - 2² = 9221777 is a prime.

It is a super-2 number, since 2×9221781² = 170082489623922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9221789) 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, 66756 + ... + 66893.

It is an arithmetic number, because the mean of its divisors is an integer number (1603800).

Almost surely, 2^9221781 is an apocalyptic number.

It is an amenable number.

9221781 is a deficient number, since it is larger than the sum of its proper divisors (3608619).

9221781 is a wasteful number, since it uses less digits than its factorization.

9221781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133675.

The product of its digits is 2016, while the sum is 30.

The square root of 9221781 is about 3036.7385465331. The cubic root of 9221781 is about 209.7031406433.

The spelling of 9221781 in words is "nine million, two hundred twenty-one thousand, seven hundred eighty-one".