2904581 has 4 divisors (see below), whose sum is σ = 2911500. Its totient is φ = 2897664.

The previous prime is 2904571. The next prime is 2904599. The reversal of 2904581 is 1854092.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 828100 + 2076481 = 910^2 + 1441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2904581 is a prime.

It is a super-2 number, since 2×2904581² = 16873181571122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2904541) 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, 2786 + ... + 3683.

It is an arithmetic number, because the mean of its divisors is an integer number (727875).

2^2904581 is an apocalyptic number.

It is an amenable number.

2904581 is a deficient number, since it is larger than the sum of its proper divisors (6919).

2904581 is an equidigital number, since it uses as much as digits as its factorization.

2904581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6918.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 2904581 is about 1704.2831337545. The cubic root of 2904581 is about 142.6793637587.

The spelling of 2904581 in words is "two million, nine hundred four thousand, five hundred eighty-one".