581216 has 24 divisors (see below), whose sum is σ = 1174824. Its totient is φ = 282880.

The previous prime is 581201. The next prime is 581227. The reversal of 581216 is 612185.

581216 = T₂₉ + T₃₀ + ... + T₁₅₁.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 581191 and 581200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1091 + ... + 1533.

It is an arithmetic number, because the mean of its divisors is an integer number (48951).

2⁵⁸¹²¹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 581216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (587412).

581216 is an abundant number, since it is smaller than the sum of its proper divisors (593608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

581216 is a wasteful number, since it uses less digits than its factorization.

581216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 486 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 581216 is about 762.3752356943. The cubic root of 581216 is about 83.4537494712.

It can be divided in two parts, 581 and 216, that added together give a palindrome (797).

The spelling of 581216 in words is "five hundred eighty-one thousand, two hundred sixteen".