2491263923 has 4 divisors (see below), whose sum is σ = 2492114520. Its totient is φ = 2490413328.

The previous prime is 2491263917. The next prime is 2491263941. The reversal of 2491263923 is 3293621942.

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 2491263923 - 2¹⁰ = 2491262899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2491263913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420890 + ... + 426767.

It is an arithmetic number, because the mean of its divisors is an integer number (623028630).

Almost surely, 2^2491263923 is an apocalyptic number.

2491263923 is a deficient number, since it is larger than the sum of its proper divisors (850597).

2491263923 is an equidigital number, since it uses as much as digits as its factorization.

2491263923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850596.

The product of its digits is 139968, while the sum is 41.

The square root of 2491263923 is about 49912.5627773209. The cubic root of 2491263923 is about 1355.6260725225.

The spelling of 2491263923 in words is "two billion, four hundred ninety-one million, two hundred sixty-three thousand, nine hundred twenty-three".