2428581 has 4 divisors (see below), whose sum is σ = 3238112. Its totient is φ = 1619052.

The previous prime is 2428577. The next prime is 2428627. The reversal of 2428581 is 1858242.

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 2428581 - 2² = 2428577 is a prime.

It is a super-2 number, since 2×2428581² = 11796011347122, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2428541) 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, 404761 + ... + 404766.

It is an arithmetic number, because the mean of its divisors is an integer number (809528).

2^2428581 is an apocalyptic number.

It is an amenable number.

2428581 is a deficient number, since it is larger than the sum of its proper divisors (809531).

2428581 is an equidigital number, since it uses as much as digits as its factorization.

2428581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809530.

The product of its digits is 5120, while the sum is 30.

The square root of 2428581 is about 1558.3905158849. The cubic root of 2428581 is about 134.4159681105.

The spelling of 2428581 in words is "two million, four hundred twenty-eight thousand, five hundred eighty-one".