9228781 has 4 divisors (see below), whose sum is σ = 9366592. Its totient is φ = 9090972.

The previous prime is 9228767. The next prime is 9228787. The reversal of 9228781 is 1878229.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9228781 - 2⁵ = 9228749 is a prime.

It is a super-2 number, since 2×9228781² = 170340797491922, which contains 22 as substring.

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 9228781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9228787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68805 + ... + 68938.

It is an arithmetic number, because the mean of its divisors is an integer number (2341648).

Almost surely, 2^9228781 is an apocalyptic number.

It is an amenable number.

9228781 is a deficient number, since it is larger than the sum of its proper divisors (137811).

9228781 is a wasteful number, since it uses less digits than its factorization.

9228781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137810.

The product of its digits is 16128, while the sum is 37.

The square root of 9228781 is about 3037.8908801996. The cubic root of 9228781 is about 209.7561871832.

The spelling of 9228781 in words is "nine million, two hundred twenty-eight thousand, seven hundred eighty-one".