581116421 has 8 divisors (see below), whose sum is σ = 605689344. Its totient is φ = 556907760.

The previous prime is 581116409. The next prime is 581116447. The reversal of 581116421 is 124611185.

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 581116421 - 2⁶ = 581116357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581116721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87806 + ... + 94191.

It is an arithmetic number, because the mean of its divisors is an integer number (75711168).

Almost surely, 2^581116421 is an apocalyptic number.

It is an amenable number.

581116421 is a deficient number, since it is larger than the sum of its proper divisors (24572923).

581116421 is a wasteful number, since it uses less digits than its factorization.

581116421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182131.

The product of its digits is 1920, while the sum is 29.

The square root of 581116421 is about 24106.3564438926. The cubic root of 581116421 is about 834.4898319064.

It can be divided in two parts, 5811164 and 21, that added together give a palindrome (5811185).

The spelling of 581116421 in words is "five hundred eighty-one million, one hundred sixteen thousand, four hundred twenty-one".