4561581 has 4 divisors (see below), whose sum is σ = 6082112. Its totient is φ = 3041052.

The previous prime is 4561553. The next prime is 4561589. The reversal of 4561581 is 1851654.

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 4561581 - 2⁹ = 4561069 is a prime.

It is a super-2 number, since 2×4561581² = 41616042439122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4561589) 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, 760261 + ... + 760266.

It is an arithmetic number, because the mean of its divisors is an integer number (1520528).

Almost surely, 2^4561581 is an apocalyptic number.

It is an amenable number.

4561581 is a deficient number, since it is larger than the sum of its proper divisors (1520531).

4561581 is a wasteful number, since it uses less digits than its factorization.

4561581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520530.

The product of its digits is 4800, while the sum is 30.

The square root of 4561581 is about 2135.7858038670. The cubic root of 4561581 is about 165.8460492650.

The spelling of 4561581 in words is "four million, five hundred sixty-one thousand, five hundred eighty-one".