853908851 has 4 divisors (see below), whose sum is σ = 857670792. Its totient is φ = 850146912.

The previous prime is 853908823. The next prime is 853908859. The reversal of 853908851 is 158809358.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158809358 = 2 ⋅79404679.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-853908851 is a prime.

It is a super-2 number, since 2×853908851² = 1458320651632280402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 853908796 and 853908805.

It is not an unprimeable number, because it can be changed into a prime (853908859) 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, 1880630 + ... + 1881083.

It is an arithmetic number, because the mean of its divisors is an integer number (214417698).

Almost surely, 2^853908851 is an apocalyptic number.

853908851 is a deficient number, since it is larger than the sum of its proper divisors (3761941).

853908851 is a wasteful number, since it uses less digits than its factorization.

853908851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3761940.

The product of its (nonzero) digits is 345600, while the sum is 47.

The square root of 853908851 is about 29221.7188235052. The cubic root of 853908851 is about 948.7180681667.

The spelling of 853908851 in words is "eight hundred fifty-three million, nine hundred eight thousand, eight hundred fifty-one".