1144381781 has 4 divisors (see below), whose sum is σ = 1148604864. Its totient is φ = 1140158700.

The previous prime is 1144381757. The next prime is 1144381793. The reversal of 1144381781 is 1871834411.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1144381781 is a prime.

It is a super-2 number, since 2×1144381781² = 2619219321369463922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144381181) 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, 2111135 + ... + 2111676.

It is an arithmetic number, because the mean of its divisors is an integer number (287151216).

Almost surely, 2^1144381781 is an apocalyptic number.

It is an amenable number.

1144381781 is a deficient number, since it is larger than the sum of its proper divisors (4223083).

1144381781 is an equidigital number, since it uses as much as digits as its factorization.

1144381781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223082.

The product of its digits is 21504, while the sum is 38.

The square root of 1144381781 is about 33828.7123757320. The cubic root of 1144381781 is about 1045.9806369780.

The spelling of 1144381781 in words is "one billion, one hundred forty-four million, three hundred eighty-one thousand, seven hundred eighty-one".