853518921 has 4 divisors (see below), whose sum is σ = 1138025232. Its totient is φ = 569012612.

The previous prime is 853518899. The next prime is 853518973. The reversal of 853518921 is 129815358.

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 853518921 - 2⁶ = 853518857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (853518121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142253151 + ... + 142253156.

It is an arithmetic number, because the mean of its divisors is an integer number (284506308).

Almost surely, 2^853518921 is an apocalyptic number.

It is an amenable number.

853518921 is a deficient number, since it is larger than the sum of its proper divisors (284506311).

853518921 is a wasteful number, since it uses less digits than its factorization.

853518921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284506310.

The product of its digits is 86400, while the sum is 42.

The square root of 853518921 is about 29215.0461406447. The cubic root of 853518921 is about 948.5736382473.

The spelling of 853518921 in words is "eight hundred fifty-three million, five hundred eighteen thousand, nine hundred twenty-one".