1143871689 has 4 divisors (see below), whose sum is σ = 1525162256. Its totient is φ = 762581124.

The previous prime is 1143871661. The next prime is 1143871709. The reversal of 1143871689 is 9861783411.

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 not a de Polignac number, because 1143871689 - 2⁵ = 1143871657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1143871189) 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, 190645279 + ... + 190645284.

It is an arithmetic number, because the mean of its divisors is an integer number (381290564).

Almost surely, 2^1143871689 is an apocalyptic number.

It is an amenable number.

1143871689 is a deficient number, since it is larger than the sum of its proper divisors (381290567).

1143871689 is an equidigital number, since it uses as much as digits as its factorization.

1143871689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381290566.

The product of its digits is 290304, while the sum is 48.

The square root of 1143871689 is about 33821.1722002653. The cubic root of 1143871689 is about 1045.8252035212.

The spelling of 1143871689 in words is "one billion, one hundred forty-three million, eight hundred seventy-one thousand, six hundred eighty-nine".