805854553 has 24 divisors (see below), whose sum is σ = 988046208. Its totient is φ = 641615232.

The previous prime is 805854551. The next prime is 805854649. The reversal of 805854553 is 355458508.

It is not a de Polignac number, because 805854553 - 2¹ = 805854551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805854551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 819300 + ... + 820282.

It is an arithmetic number, because the mean of its divisors is an integer number (41168592).

Almost surely, 2^805854553 is an apocalyptic number.

805854553 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

It is an amenable number.

805854553 is a deficient number, since it is larger than the sum of its proper divisors (182191655).

805854553 is an equidigital number, since it uses as much as digits as its factorization.

805854553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 43.

The square root of 805854553 is about 28387.5774415500. The cubic root of 805854553 is about 930.5768006236.

The spelling of 805854553 in words is "eight hundred five million, eight hundred fifty-four thousand, five hundred fifty-three".