2725581 has 4 divisors (see below), whose sum is σ = 3634112. Its totient is φ = 1817052.

The previous prime is 2725571. The next prime is 2725621. The reversal of 2725581 is 1855272.

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 2725581 - 2⁶ = 2725517 is a prime.

It is a super-2 number, since 2×2725581² = 14857583575122, 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 (2725501) 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, 454261 + ... + 454266.

It is an arithmetic number, because the mean of its divisors is an integer number (908528).

2^2725581 is an apocalyptic number.

It is an amenable number.

2725581 is a deficient number, since it is larger than the sum of its proper divisors (908531).

2725581 is an equidigital number, since it uses as much as digits as its factorization.

2725581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908530.

The product of its digits is 5600, while the sum is 30.

The square root of 2725581 is about 1650.9333723685. The cubic root of 2725581 is about 139.6860481859.

The spelling of 2725581 in words is "two million, seven hundred twenty-five thousand, five hundred eighty-one".