1143989899 has 6 divisors (see below), whose sum is σ = 1238758476. Its totient is φ = 1055990520.

The previous prime is 1143989837. The next prime is 1143989929. The reversal of 1143989899 is 9989893411.

It is not a de Polignac number, because 1143989899 - 2²¹ = 1141892747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1143989809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3384417 + ... + 3384754.

It is an arithmetic number, because the mean of its divisors is an integer number (206459746).

Almost surely, 2^1143989899 is an apocalyptic number.

1143989899 is a deficient number, since it is larger than the sum of its proper divisors (94768577).

1143989899 is an equidigital number, since it uses as much as digits as its factorization.

1143989899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6769197 (or 6769184 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 61.

The square root of 1143989899 is about 33822.9197290831. The cubic root of 1143989899 is about 1045.8612281733.

The spelling of 1143989899 in words is "one billion, one hundred forty-three million, nine hundred eighty-nine thousand, eight hundred ninety-nine".