2491187 has 4 divisors (see below), whose sum is σ = 2577120. Its totient is φ = 2405256.

The previous prime is 2491171. The next prime is 2491189. The reversal of 2491187 is 7811942.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2491187 - 2⁴ = 2491171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2491189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42923 + ... + 42980.

It is an arithmetic number, because the mean of its divisors is an integer number (644280).

2^2491187 is an apocalyptic number.

2491187 is a deficient number, since it is larger than the sum of its proper divisors (85933).

2491187 is an equidigital number, since it uses as much as digits as its factorization.

2491187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85932.

The product of its digits is 4032, while the sum is 32.

The square root of 2491187 is about 1578.3494543351. The cubic root of 2491187 is about 135.5612119779.

The spelling of 2491187 in words is "two million, four hundred ninety-one thousand, one hundred eighty-seven".