1143281000 has 32 divisors (see below), whose sum is σ = 2675279880. Its totient is φ = 457312000.

The previous prime is 1143280993. The next prime is 1143281011. The reversal of 1143281000 is 1823411.

It can be written as a sum of positive squares in 4 ways, for example, as 328406884 + 814874116 = 18122^2 + 28546^2 .

It is a super-2 number, since 2×1143281000² = 2614182889922000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 570641 + ... + 572640.

Almost surely, 2^1143281000 is an apocalyptic number.

1143281000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1143281000 is an abundant number, since it is smaller than the sum of its proper divisors (1531998880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1143281000 is a wasteful number, since it uses less digits than its factorization.

1143281000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143302 (or 1143288 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1143281000 is about 33812.4385396854. The cubic root of 1143281000 is about 1045.6451530792.

The spelling of 1143281000 in words is "one billion, one hundred forty-three million, two hundred eighty-one thousand".