2491287 has 8 divisors (see below), whose sum is σ = 3329136. Its totient is φ = 1657152.

The previous prime is 2491259. The next prime is 2491289. The reversal of 2491287 is 7821942.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2491287 - 2⁸ = 2491031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1723 + ... + 2819.

It is an arithmetic number, because the mean of its divisors is an integer number (416142).

2^2491287 is an apocalyptic number.

2491287 is a deficient number, since it is larger than the sum of its proper divisors (837849).

2491287 is a wasteful number, since it uses less digits than its factorization.

2491287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857.

The product of its digits is 8064, while the sum is 33.

The square root of 2491287 is about 1578.3811326799. The cubic root of 2491287 is about 135.5630258308.

The spelling of 2491287 in words is "two million, four hundred ninety-one thousand, two hundred eighty-seven".