2491815 has 16 divisors (see below), whose sum is σ = 4007808. Its totient is φ = 1322016.

The previous prime is 2491813. The next prime is 2491829. The reversal of 2491815 is 5181942.

It is a happy number.

It is not a de Polignac number, because 2491815 - 2¹ = 2491813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3952 + ... + 4538.

It is an arithmetic number, because the mean of its divisors is an integer number (250488).

2^2491815 is an apocalyptic number.

2491815 is a deficient number, since it is larger than the sum of its proper divisors (1515993).

2491815 is a wasteful number, since it uses less digits than its factorization.

2491815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878.

The product of its digits is 2880, while the sum is 30.

The square root of 2491815 is about 1578.5483838008. The cubic root of 2491815 is about 135.5726021691.

The spelling of 2491815 in words is "two million, four hundred ninety-one thousand, eight hundred fifteen".