244137891 has 4 divisors (see below), whose sum is σ = 325517192. Its totient is φ = 162758592.

The previous prime is 244137871. The next prime is 244137899. The reversal of 244137891 is 198731442.

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

It is not a de Polignac number, because 244137891 - 2¹⁵ = 244105123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (244137899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40689646 + ... + 40689651.

It is an arithmetic number, because the mean of its divisors is an integer number (81379298).

Almost surely, 2^244137891 is an apocalyptic number.

244137891 is a deficient number, since it is larger than the sum of its proper divisors (81379301).

244137891 is an equidigital number, since it uses as much as digits as its factorization.

244137891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81379300.

The product of its digits is 48384, while the sum is 39.

The square root of 244137891 is about 15624.9125117551. The cubic root of 244137891 is about 624.9976669780.

The spelling of 244137891 in words is "two hundred forty-four million, one hundred thirty-seven thousand, eight hundred ninety-one".