581086421 has 4 divisors (see below), whose sum is σ = 606351072. Its totient is φ = 555821772.

The previous prime is 581086411. The next prime is 581086423. The reversal of 581086421 is 124680185.

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.

It is not a de Polignac number, because 581086421 - 2¹⁰ = 581085397 is a prime.

It is a super-2 number, since 2×581086421² = 675322857341178482, 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 (581086423) 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, 12632291 + ... + 12632336.

It is an arithmetic number, because the mean of its divisors is an integer number (151587768).

Almost surely, 2^581086421 is an apocalyptic number.

It is an amenable number.

581086421 is a deficient number, since it is larger than the sum of its proper divisors (25264651).

581086421 is a wasteful number, since it uses less digits than its factorization.

581086421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25264650.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 581086421 is about 24105.7341933408. The cubic root of 581086421 is about 834.4754715448.

The spelling of 581086421 in words is "five hundred eighty-one million, eighty-six thousand, four hundred twenty-one".