2509491 has 4 divisors (see below), whose sum is σ = 3345992. Its totient is φ = 1672992.

The previous prime is 2509483. The next prime is 2509499. The reversal of 2509491 is 1949052.

It is a happy number.

2509491 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.

It is an interprime number because it is at equal distance from previous prime (2509483) and next prime (2509499).

It is not a de Polignac number, because 2509491 - 2³ = 2509483 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2509499) 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, 418246 + ... + 418251.

It is an arithmetic number, because the mean of its divisors is an integer number (836498).

2^2509491 is an apocalyptic number.

2509491 is a deficient number, since it is larger than the sum of its proper divisors (836501).

2509491 is an equidigital number, since it uses as much as digits as its factorization.

2509491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836500.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 2509491 is about 1584.1373046551. The cubic root of 2509491 is about 135.8924141934.

The spelling of 2509491 in words is "two million, five hundred nine thousand, four hundred ninety-one".