4216581 has 6 divisors (see below), whose sum is σ = 6090630. Its totient is φ = 2811048.

The previous prime is 4216579. The next prime is 4216591. The reversal of 4216581 is 1856124.

4216581 is a `hidden beast` number, since 4 + 2 + 1 + 658 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3132900 + 1083681 = 1770^2 + 1041^2 .

It is not a de Polignac number, because 4216581 - 2¹ = 4216579 is a prime.

It is a super-2 number, since 2×4216581² = 35559110659122, which contains 22 as substring.

4216581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4216501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 234246 + ... + 234263.

It is an arithmetic number, because the mean of its divisors is an integer number (1015105).

Almost surely, 2^4216581 is an apocalyptic number.

It is an amenable number.

4216581 is a deficient number, since it is larger than the sum of its proper divisors (1874049).

4216581 is a wasteful number, since it uses less digits than its factorization.

4216581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468515 (or 468512 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 4216581 is about 2053.4315182153. The cubic root of 4216581 is about 161.5549053381.

The spelling of 4216581 in words is "four million, two hundred sixteen thousand, five hundred eighty-one".