2499581 has 4 divisors (see below), whose sum is σ = 2856672. Its totient is φ = 2142492.

The previous prime is 2499577. The next prime is 2499589. The reversal of 2499581 is 1859942.

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 2499581 - 2² = 2499577 is a prime.

It is a super-2 number, since 2×2499581² = 12495810351122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2499589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178535 + ... + 178548.

It is an arithmetic number, because the mean of its divisors is an integer number (714168).

2^2499581 is an apocalyptic number.

It is an amenable number.

2499581 is a deficient number, since it is larger than the sum of its proper divisors (357091).

2499581 is an equidigital number, since it uses as much as digits as its factorization.

2499581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357090.

The product of its digits is 25920, while the sum is 38.

The square root of 2499581 is about 1581.0063250980. The cubic root of 2499581 is about 135.7132981329.

The spelling of 2499581 in words is "two million, four hundred ninety-nine thousand, five hundred eighty-one".