4013581 has 24 divisors (see below), whose sum is σ = 5059584. Its totient is φ = 3144960.

The previous prime is 4013573. The next prime is 4013591. The reversal of 4013581 is 1853104.

It is not a de Polignac number, because 4013581 - 2³ = 4013573 is a prime.

It is a super-2 number, since 2×4013581² = 32217664887122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4013521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31540 + ... + 31666.

It is an arithmetic number, because the mean of its divisors is an integer number (210816).

Almost surely, 2^4013581 is an apocalyptic number.

It is an amenable number.

4013581 is a deficient number, since it is larger than the sum of its proper divisors (1046003).

4013581 is a wasteful number, since it uses less digits than its factorization.

4013581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 4013581 is about 2003.3923729514. The cubic root of 4013581 is about 158.9195563700.

Adding to 4013581 its reverse (1853104), we get a palindrome (5866685).

The spelling of 4013581 in words is "four million, thirteen thousand, five hundred eighty-one".