1143278861 has 8 divisors (see below), whose sum is σ = 1183215000. Its totient is φ = 1103376960.

The previous prime is 1143278831. The next prime is 1143278869. The reversal of 1143278861 is 1688723411.

It can be written as a sum of positive squares in 4 ways, for example, as 22033636 + 1121245225 = 4694^2 + 33485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1143278861 - 2³⁰ = 69537037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143278869) by changing a digit.

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, 72551 + ... + 86891.

It is an arithmetic number, because the mean of its divisors is an integer number (147901875).

Almost surely, 2^1143278861 is an apocalyptic number.

It is an amenable number.

1143278861 is a deficient number, since it is larger than the sum of its proper divisors (39936139).

1143278861 is a wasteful number, since it uses less digits than its factorization.

1143278861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17119.

The product of its digits is 64512, while the sum is 41.

The square root of 1143278861 is about 33812.4069092988. The cubic root of 1143278861 is about 1045.6445009688.

The spelling of 1143278861 in words is "one billion, one hundred forty-three million, two hundred seventy-eight thousand, eight hundred sixty-one".