581164481 has 4 divisors (see below), whose sum is σ = 583232964. Its totient is φ = 579096000.

The previous prime is 581164433. The next prime is 581164487. The reversal of 581164481 is 184461185.

581164481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 249924481 + 331240000 = 15809^2 + 18200^2 .

It is a cyclic number.

It is not a de Polignac number, because 581164481 - 2⁶ = 581164417 is a prime.

It is a super-2 number, since 2×581164481² = 675504307951998722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (581164487) 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, 1033820 + ... + 1034381.

It is an arithmetic number, because the mean of its divisors is an integer number (145808241).

Almost surely, 2^581164481 is an apocalyptic number.

It is an amenable number.

581164481 is a deficient number, since it is larger than the sum of its proper divisors (2068483).

581164481 is a wasteful number, since it uses less digits than its factorization.

581164481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2068482.

The product of its digits is 30720, while the sum is 38.

The square root of 581164481 is about 24107.3532558014. The cubic root of 581164481 is about 834.5128361756.

The spelling of 581164481 in words is "five hundred eighty-one million, one hundred sixty-four thousand, four hundred eighty-one".