2489581 has 4 divisors (see below), whose sum is σ = 2509312. Its totient is φ = 2469852.

The previous prime is 2489573. The next prime is 2489603. The reversal of 2489581 is 1859842.

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 a cyclic number.

It is not a de Polignac number, because 2489581 - 2³ = 2489573 is a prime.

It is a super-2 number, since 2×2489581² = 12396027111122, which contains 22 as substring.

It is a Duffinian number.

2489581 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2489581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2489521) 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, 9675 + ... + 9928.

It is an arithmetic number, because the mean of its divisors is an integer number (627328).

2^2489581 is an apocalyptic number.

It is an amenable number.

2489581 is a deficient number, since it is larger than the sum of its proper divisors (19731).

2489581 is a wasteful number, since it uses less digits than its factorization.

2489581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19730.

The product of its digits is 23040, while the sum is 37.

The square root of 2489581 is about 1577.8406129898. The cubic root of 2489581 is about 135.5320748494.

It can be divided in two parts, 24895 and 81, that added together give a triangular number (24976 = T₂₂₃).

The spelling of 2489581 in words is "two million, four hundred eighty-nine thousand, five hundred eighty-one".