1805005081 has 16 divisors (see below), whose sum is σ = 2001623040. Its totient is φ = 1613934720.

The previous prime is 1805005057. The next prime is 1805005087.

1805005081 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1805005081 - 2⁵ = 1805005049 is a prime.

It is a super-2 number, since 2×1805005081² = 6516086684871633122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1805005087) 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, 304615 + ... + 310483.

It is an arithmetic number, because the mean of its divisors is an integer number (125101440).

Almost surely, 2^1805005081 is an apocalyptic number.

1805005081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1805005081 is a deficient number, since it is larger than the sum of its proper divisors (196617959).

1805005081 is a wasteful number, since it uses less digits than its factorization.

1805005081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6336.

The product of its (nonzero) digits is 1600, while the sum is 28.

The square root of 1805005081 is about 42485.3513696192. The cubic root of 1805005081 is about 1217.5668339870.

It can be divided in two parts, 180500 and 5081, that added together give a palindrome (185581).

The spelling of 1805005081 in words is "one billion, eight hundred five million, five thousand, eighty-one".