853821381 has 16 divisors (see below), whose sum is σ = 1311309824. Its totient is φ = 484054704.

The previous prime is 853821349. The next prime is 853821383. The reversal of 853821381 is 183128358.

853821381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 853821381 - 2⁵ = 853821349 is a prime.

It is a super-2 number, since 2×853821381² = 1458021901305494322, which contains 22 as substring.

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 (853821383) 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, 157405 + ... + 162738.

It is an arithmetic number, because the mean of its divisors is an integer number (81956864).

Almost surely, 2^853821381 is an apocalyptic number.

It is an amenable number.

853821381 is a deficient number, since it is larger than the sum of its proper divisors (457488443).

853821381 is a wasteful number, since it uses less digits than its factorization.

853821381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320280.

The product of its digits is 46080, while the sum is 39.

The square root of 853821381 is about 29220.2221244124. Note that the first 3 decimals coincide. The cubic root of 853821381 is about 948.6856731388.

The spelling of 853821381 in words is "eight hundred fifty-three million, eight hundred twenty-one thousand, three hundred eighty-one".