1244436881 has 4 divisors (see below), whose sum is σ = 1248865764. Its totient is φ = 1240008000.

The previous prime is 1244436859. The next prime is 1244436883. The reversal of 1244436881 is 1886344421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1886344421 = 13 ⋅145103417.

It can be written as a sum of positive squares in 2 ways, for example, as 1090056256 + 154380625 = 33016^2 + 12425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244436881 - 2²⁶ = 1177328017 is a prime.

It is a super-2 number, since 2×1244436881² = 3097246301586016322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1244436883) 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, 2214020 + ... + 2214581.

It is an arithmetic number, because the mean of its divisors is an integer number (312216441).

Almost surely, 2^1244436881 is an apocalyptic number.

It is an amenable number.

1244436881 is a deficient number, since it is larger than the sum of its proper divisors (4428883).

1244436881 is an equidigital number, since it uses as much as digits as its factorization.

1244436881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428882.

The product of its digits is 147456, while the sum is 41.

The square root of 1244436881 is about 35276.5769456165. The cubic root of 1244436881 is about 1075.6169182242.

The spelling of 1244436881 in words is "one billion, two hundred forty-four million, four hundred thirty-six thousand, eight hundred eighty-one".