1144139999 has 4 divisors (see below), whose sum is σ = 1144796664. Its totient is φ = 1143483336.

The previous prime is 1144139993. The next prime is 1144140047. The reversal of 1144139999 is 9999314411.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1144139999 - 2²⁰ = 1143091423 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 (1144139993) 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, 325712 + ... + 329205.

It is an arithmetic number, because the mean of its divisors is an integer number (286199166).

Almost surely, 2^1144139999 is an apocalyptic number.

1144139999 is a deficient number, since it is larger than the sum of its proper divisors (656665).

1144139999 is an equidigital number, since it uses as much as digits as its factorization.

1144139999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656664.

The product of its digits is 314928, while the sum is 50.

The square root of 1144139999 is about 33825.1385658655. The cubic root of 1144139999 is about 1045.9069677686.

The spelling of 1144139999 in words is "one billion, one hundred forty-four million, one hundred thirty-nine thousand, nine hundred ninety-nine".