2046005581 has 4 divisors (see below), whose sum is σ = 2066263164. Its totient is φ = 2025748000.

The previous prime is 2046005579. The next prime is 2046005597. The reversal of 2046005581 is 1855006402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1746404100 + 299601481 = 41790^2 + 17309^2 .

It is a cyclic number.

It is not a de Polignac number, because 2046005581 - 2¹ = 2046005579 is a prime.

It is a super-2 number, since 2×2046005581² = 8372277674966295122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2046005501) 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, 10128640 + ... + 10128841.

It is an arithmetic number, because the mean of its divisors is an integer number (516565791).

Almost surely, 2^2046005581 is an apocalyptic number.

It is an amenable number.

2046005581 is a deficient number, since it is larger than the sum of its proper divisors (20257583).

2046005581 is a wasteful number, since it uses less digits than its factorization.

2046005581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20257582.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 2046005581 is about 45232.7932036040. The cubic root of 2046005581 is about 1269.5084755486.

The spelling of 2046005581 in words is "two billion, forty-six million, five thousand, five hundred eighty-one".