1144000781 has 16 divisors (see below), whose sum is σ = 1472299008. Its totient is φ = 862671600.

The previous prime is 1144000763. The next prime is 1144000789. The reversal of 1144000781 is 1870004411.

It is not a de Polignac number, because 1144000781 - 2⁶ = 1144000717 is a prime.

It is a super-2 number, since 2×1144000781² = 2617475573857219922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1144000781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144000789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237245 + ... + 242018.

It is an arithmetic number, because the mean of its divisors is an integer number (92018688).

Almost surely, 2^1144000781 is an apocalyptic number.

1144000781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1144000781 is a deficient number, since it is larger than the sum of its proper divisors (328298227).

1144000781 is a wasteful number, since it uses less digits than its factorization.

1144000781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479312.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 1144000781 is about 33823.0805959481. The cubic root of 1144000781 is about 1045.8645443523.

The spelling of 1144000781 in words is "one billion, one hundred forty-four million, seven hundred eighty-one", and thus it is an aban number.