2581905 has 8 divisors (see below), whose sum is σ = 4131072. Its totient is φ = 1377008.

The previous prime is 2581877. The next prime is 2581907. The reversal of 2581905 is 5091852.

2581905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2581905 - 2⁹ = 2581393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2581907) 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 7 ways as a sum of consecutive naturals, for example, 86049 + ... + 86078.

It is an arithmetic number, because the mean of its divisors is an integer number (516384).

2^2581905 is an apocalyptic number.

It is an amenable number.

2581905 is a deficient number, since it is larger than the sum of its proper divisors (1549167).

2581905 is a wasteful number, since it uses less digits than its factorization.

2581905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172135.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 2581905 is about 1606.8307315956. The cubic root of 2581905 is about 137.1871454494.

It can be divided in two parts, 2581 and 905, that added together give a triangular number (3486 = T₈₃).

The spelling of 2581905 in words is "two million, five hundred eighty-one thousand, nine hundred five".