2491515 has 24 divisors (see below), whose sum is σ = 4651920. Its totient is φ = 1226304.

The previous prime is 2491499. The next prime is 2491519. The reversal of 2491515 is 5151942.

It is not a de Polignac number, because 2491515 - 2⁴ = 2491499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2491519) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1545 + ... + 2714.

It is an arithmetic number, because the mean of its divisors is an integer number (193830).

2^2491515 is an apocalyptic number.

2491515 is a deficient number, since it is larger than the sum of its proper divisors (2160405).

2491515 is a wasteful number, since it uses less digits than its factorization.

2491515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4283 (or 4280 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 2491515 is about 1578.4533569289. The cubic root of 2491515 is about 135.5671612337.

It can be divided in two parts, 249 and 1515, that added together give a square (1764 = 42²).

The spelling of 2491515 in words is "two million, four hundred ninety-one thousand, five hundred fifteen".