2491783 has 4 divisors (see below), whose sum is σ = 2847760. Its totient is φ = 2135808.

The previous prime is 2491777. The next prime is 2491787. The reversal of 2491783 is 3871942.

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 2491783 - 2²¹ = 394631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491787) 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, 177978 + ... + 177991.

It is an arithmetic number, because the mean of its divisors is an integer number (711940).

2^2491783 is an apocalyptic number.

2491783 is a deficient number, since it is larger than the sum of its proper divisors (355977).

2491783 is an equidigital number, since it uses as much as digits as its factorization.

2491783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355976.

The product of its digits is 12096, while the sum is 34.

The square root of 2491783 is about 1578.5382478736. The cubic root of 2491783 is about 135.5720218235.

The spelling of 2491783 in words is "two million, four hundred ninety-one thousand, seven hundred eighty-three".