581120261 has 8 divisors (see below), whose sum is σ = 597131544. Its totient is φ = 565125120.

The previous prime is 581120251. The next prime is 581120273. The reversal of 581120261 is 162021185.

It can be written as a sum of positive squares in 4 ways, for example, as 432889636 + 148230625 = 20806^2 + 12175^2 .

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 581120261 - 2²⁶ = 514011397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 581120261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581120251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122021 + ... + 126693.

It is an arithmetic number, because the mean of its divisors is an integer number (74641443).

Almost surely, 2^581120261 is an apocalyptic number.

It is an amenable number.

581120261 is a deficient number, since it is larger than the sum of its proper divisors (16011283).

581120261 is a wasteful number, since it uses less digits than its factorization.

581120261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8071.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 581120261 is about 24106.4360908036. The cubic root of 581120261 is about 834.4916699970.

The spelling of 581120261 in words is "five hundred eighty-one million, one hundred twenty thousand, two hundred sixty-one".