9723228149 has 4 divisors (see below), whose sum is σ = 10295182764. Its totient is φ = 9151273536.

The previous prime is 9723228103. The next prime is 9723228161. The reversal of 9723228149 is 9418223279.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5872156900 + 3851071249 = 76630^2 + 62057^2 .

It is not a de Polignac number, because 9723228149 - 2⁸ = 9723227893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9723228349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285977282 + ... + 285977315.

It is an arithmetic number, because the mean of its divisors is an integer number (2573795691).

Almost surely, 2^9723228149 is an apocalyptic number.

It is an amenable number.

9723228149 is a deficient number, since it is larger than the sum of its proper divisors (571954615).

9723228149 is a wasteful number, since it uses less digits than its factorization.

9723228149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571954614.

The product of its digits is 435456, while the sum is 47.

The square root of 9723228149 is about 98606.4305661654. The cubic root of 9723228149 is about 2134.3722154238.

The spelling of 9723228149 in words is "nine billion, seven hundred twenty-three million, two hundred twenty-eight thousand, one hundred forty-nine".