4256581 has 6 divisors (see below), whose sum is σ = 4951590. Its totient is φ = 3648456.

The previous prime is 4256573. The next prime is 4256617. The reversal of 4256581 is 1856524.

It can be written as a sum of positive squares in only one way, i.e., 3363556 + 893025 = 1834^2 + 945^2 .

It is not a de Polignac number, because 4256581 - 2³ = 4256573 is a prime.

It is a super-2 number, since 2×4256581² = 36236963619122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4256501) 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, 43386 + ... + 43483.

It is an arithmetic number, because the mean of its divisors is an integer number (825265).

Almost surely, 2^4256581 is an apocalyptic number.

It is an amenable number.

4256581 is a deficient number, since it is larger than the sum of its proper divisors (695009).

4256581 is an equidigital number, since it uses as much as digits as its factorization.

4256581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86883 (or 86876 counting only the distinct ones).

The product of its digits is 9600, while the sum is 31.

The square root of 4256581 is about 2063.1483223462. The cubic root of 4256581 is about 162.0641543396.

The spelling of 4256581 in words is "four million, two hundred fifty-six thousand, five hundred eighty-one".