805128331 has 8 divisors (see below), whose sum is σ = 921265920. Its totient is φ = 689270568.

The previous prime is 805128323. The next prime is 805128341. The reversal of 805128331 is 133821508.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 805128331 - 2³ = 805128323 is a prime.

It is a super-2 number, since 2×805128331² = 1296463258757691122, 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 = 805128293 and 805128302.

It is not an unprimeable number, because it can be changed into a prime (805128301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63751 + ... + 75328.

It is an arithmetic number, because the mean of its divisors is an integer number (115158240).

Almost surely, 2^805128331 is an apocalyptic number.

805128331 is a deficient number, since it is larger than the sum of its proper divisors (116137589).

805128331 is a wasteful number, since it uses less digits than its factorization.

805128331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139913.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 805128331 is about 28374.7833648118. The cubic root of 805128331 is about 930.2971767748.

Adding to 805128331 its reverse (133821508), we get a palindrome (938949839).

The spelling of 805128331 in words is "eight hundred five million, one hundred twenty-eight thousand, three hundred thirty-one".