9220581 has 16 divisors (see below), whose sum is σ = 13772800. Its totient is φ = 6096384.

The previous prime is 9220573. The next prime is 9220583. The reversal of 9220581 is 1850229.

9220581 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9220581 - 2³ = 9220573 is a prime.

It is a super-2 number, since 2×9220581² = 170038227955122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9220583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2085 + ... + 4773.

It is an arithmetic number, because the mean of its divisors is an integer number (860800).

Almost surely, 2^9220581 is an apocalyptic number.

It is an amenable number.

9220581 is a deficient number, since it is larger than the sum of its proper divisors (4552219).

9220581 is a wasteful number, since it uses less digits than its factorization.

9220581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825 (or 2819 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 9220581 is about 3036.5409597106. The cubic root of 9220581 is about 209.6940442556.

It can be divided in two parts, 9220 and 581, that added together give a square (9801 = 99²).

The spelling of 9220581 in words is "nine million, two hundred twenty thousand, five hundred eighty-one".