2491663043 has 4 divisors (see below), whose sum is σ = 2533894680. Its totient is φ = 2449431408.

The previous prime is 2491663033. The next prime is 2491663051. The reversal of 2491663043 is 3403661942.

It is a happy number.

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 2491663043 - 2⁸ = 2491662787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2491662988 and 2491663006.

It is not an unprimeable number, because it can be changed into a prime (2491663033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21115730 + ... + 21115847.

It is an arithmetic number, because the mean of its divisors is an integer number (633473670).

Almost surely, 2^2491663043 is an apocalyptic number.

2491663043 is a deficient number, since it is larger than the sum of its proper divisors (42231637).

2491663043 is an equidigital number, since it uses as much as digits as its factorization.

2491663043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42231636.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 2491663043 is about 49916.5608090141. The cubic root of 2491663043 is about 1355.6984626297.

The spelling of 2491663043 in words is "two billion, four hundred ninety-one million, six hundred sixty-three thousand, forty-three".