2365581 has 4 divisors (see below), whose sum is σ = 3154112. Its totient is φ = 1577052.

The previous prime is 2365553. The next prime is 2365589. The reversal of 2365581 is 1855632.

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 2365581 - 2¹⁹ = 1841293 is a prime.

It is a super-2 number, since 2×2365581² = 11191946935122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2365589) 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, 394261 + ... + 394266.

It is an arithmetic number, because the mean of its divisors is an integer number (788528).

2^2365581 is an apocalyptic number.

It is an amenable number.

2365581 is a deficient number, since it is larger than the sum of its proper divisors (788531).

2365581 is an equidigital number, since it uses as much as digits as its factorization.

2365581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788530.

The product of its digits is 7200, while the sum is 30.

The square root of 2365581 is about 1538.0445377166. The cubic root of 2365581 is about 133.2434720897.

The spelling of 2365581 in words is "two million, three hundred sixty-five thousand, five hundred eighty-one".