1244738881 has 4 divisors (see below), whose sum is σ = 1244974000. Its totient is φ = 1244503764.

The previous prime is 1244738821. The next prime is 1244738917. The reversal of 1244738881 is 1888374421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1888374421 = 14533 ⋅129937.

It is a cyclic number.

It is not a de Polignac number, because 1244738881 - 2¹¹ = 1244736833 is a prime.

It is a super-2 number, since 2×1244738881² = 3098749763746264322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1244738821) 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, 109431 + ... + 120268.

It is an arithmetic number, because the mean of its divisors is an integer number (311243500).

Almost surely, 2^1244738881 is an apocalyptic number.

It is an amenable number.

1244738881 is a deficient number, since it is larger than the sum of its proper divisors (235119).

1244738881 is an equidigital number, since it uses as much as digits as its factorization.

1244738881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235118.

The product of its digits is 344064, while the sum is 46.

The square root of 1244738881 is about 35280.8571466171. The cubic root of 1244738881 is about 1075.7039214412.

The spelling of 1244738881 in words is "one billion, two hundred forty-four million, seven hundred thirty-eight thousand, eight hundred eighty-one".