1139 has 4 divisors (see below), whose sum is σ = 1224.
Its totient is φ = 1056.
The previous prime is 1129. The next prime is 1151. The reversal of 1139 is 9311.
1139 = T2 + T3 + ... +
1139 is nontrivially palindromic in base 14.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.
It is a cyclic number.
It is not a de Polignac number, because 1139 - 24 = 1123 is a prime.
1139 is an undulating number in base 14.
It is a plaindrome in base 10 and base 12.
It is not an unprimeable number, because it can be changed into a prime (1109) 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, 17 + ... + 50.
It is an arithmetic number, because the mean of its divisors is an integer number (306).
21139 is an apocalyptic number.
1139 is a deficient number, since it is larger than the sum of its proper divisors (85).
1139 is an equidigital number, since it uses as much as digits as its factorization.
1139 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 84.
The product of its digits is 27, while the sum is 14.
The square root of 1139 is about 33.7490740614.
The cubic root of 1139 is about 10.4433838602.
The spelling of 1139 in words is "one thousand, one hundred thirty-nine".