2164559581 has 8 divisors (see below), whose sum is σ = 2172110400. Its totient is φ = 2157019200.

The previous prime is 2164559549. The next prime is 2164559597. The reversal of 2164559581 is 1859554612.

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

It is a cyclic number.

It is not a de Polignac number, because 2164559581 - 2⁵ = 2164559549 is a prime.

It is a super-2 number, since 2×2164559581² = 9370636359397791122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164559521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 771381 + ... + 774181.

It is an arithmetic number, because the mean of its divisors is an integer number (271513800).

Almost surely, 2^2164559581 is an apocalyptic number.

It is an amenable number.

2164559581 is a deficient number, since it is larger than the sum of its proper divisors (7550819).

2164559581 is a wasteful number, since it uses less digits than its factorization.

2164559581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5219.

The product of its digits is 432000, while the sum is 46.

The square root of 2164559581 is about 46524.8275762522. The cubic root of 2164559581 is about 1293.5697413804.

The spelling of 2164559581 in words is "two billion, one hundred sixty-four million, five hundred fifty-nine thousand, five hundred eighty-one".