581868461 has 4 divisors (see below), whose sum is σ = 587306592. Its totient is φ = 576430332.

The previous prime is 581868449. The next prime is 581868479. The reversal of 581868461 is 164868185.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 164868185 = 5 ⋅32973637.

It is a cyclic number.

It is not a de Polignac number, because 581868461 - 2¹⁰ = 581867437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581861461) 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 3 ways as a sum of consecutive naturals, for example, 2718905 + ... + 2719118.

It is an arithmetic number, because the mean of its divisors is an integer number (146826648).

Almost surely, 2^581868461 is an apocalyptic number.

It is an amenable number.

581868461 is a deficient number, since it is larger than the sum of its proper divisors (5438131).

581868461 is a wasteful number, since it uses less digits than its factorization.

581868461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5438130.

The product of its digits is 368640, while the sum is 47.

The square root of 581868461 is about 24121.9497760857. The cubic root of 581868461 is about 834.8496560805.

The spelling of 581868461 in words is "five hundred eighty-one million, eight hundred sixty-eight thousand, four hundred sixty-one".