2730581 has 4 divisors (see below), whose sum is σ = 3120672. Its totient is φ = 2340492.

The previous prime is 2730577. The next prime is 2730587. The reversal of 2730581 is 1850372.

2730581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2730581 - 2² = 2730577 is a prime.

It is a super-2 number, since 2×2730581² = 14912145195122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2730581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2730587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195035 + ... + 195048.

It is an arithmetic number, because the mean of its divisors is an integer number (780168).

2^2730581 is an apocalyptic number.

It is an amenable number.

2730581 is a deficient number, since it is larger than the sum of its proper divisors (390091).

2730581 is an equidigital number, since it uses as much as digits as its factorization.

2730581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390090.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 2730581 is about 1652.4469734306. The cubic root of 2730581 is about 139.7714126877.

The spelling of 2730581 in words is "two million, seven hundred thirty thousand, five hundred eighty-one".