2205861581 has 24 divisors (see below), whose sum is σ = 2777295360. Its totient is φ = 1714949280.

The previous prime is 2205861557. The next prime is 2205861607. The reversal of 2205861581 is 1851685022.

It is not a de Polignac number, because 2205861581 - 2⁶ = 2205861517 is a prime.

It is a super-2 number, since 2×2205861581² = 9731650629063639122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2205861881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 402995 + ... + 408431.

It is an arithmetic number, because the mean of its divisors is an integer number (115720640).

Almost surely, 2^2205861581 is an apocalyptic number.

It is an amenable number.

2205861581 is a deficient number, since it is larger than the sum of its proper divisors (571433779).

2205861581 is a wasteful number, since it uses less digits than its factorization.

2205861581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5945 (or 5934 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 2205861581 is about 46966.6006966653. The cubic root of 2205861581 is about 1301.7455016283.

The spelling of 2205861581 in words is "two billion, two hundred five million, eight hundred sixty-one thousand, five hundred eighty-one".