853728521 has 4 divisors (see below), whose sum is σ = 854612352. Its totient is φ = 852844692.

The previous prime is 853728511. The next prime is 853728523. The reversal of 853728521 is 125827358.

853728521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125827358 = 2 ⋅62913679.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-853728521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853728523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440465 + ... + 442398.

It is an arithmetic number, because the mean of its divisors is an integer number (213653088).

Almost surely, 2^853728521 is an apocalyptic number.

It is an amenable number.

853728521 is a deficient number, since it is larger than the sum of its proper divisors (883831).

853728521 is an equidigital number, since it uses as much as digits as its factorization.

853728521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883830.

The product of its digits is 134400, while the sum is 41.

The square root of 853728521 is about 29218.6331131352. The cubic root of 853728521 is about 948.6512794716.

The spelling of 853728521 in words is "eight hundred fifty-three million, seven hundred twenty-eight thousand, five hundred twenty-one".