9521428723 has 8 divisors (see below), whose sum is σ = 9659526800. Its totient is φ = 9384145920.

The previous prime is 9521428687. The next prime is 9521428727. The reversal of 9521428723 is 3278241259.

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 9521428723 - 2⁹ = 9521428211 is a prime.

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 9521428723.

It is not an unprimeable number, because it can be changed into a prime (9521428727) 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 7 ways as a sum of consecutive naturals, for example, 180273 + ... + 227026.

It is an arithmetic number, because the mean of its divisors is an integer number (1207440850).

Almost surely, 2^9521428723 is an apocalyptic number.

9521428723 is a deficient number, since it is larger than the sum of its proper divisors (138098077).

9521428723 is a wasteful number, since it uses less digits than its factorization.

9521428723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407637.

The product of its digits is 241920, while the sum is 43.

The square root of 9521428723 is about 97577.8085580938. The cubic root of 9521428723 is about 2119.5030224492.

It can be divided in two parts, 9521 and 428723, that added together give a square (438244 = 662²).

The spelling of 9521428723 in words is "nine billion, five hundred twenty-one million, four hundred twenty-eight thousand, seven hundred twenty-three".