It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-61139 is a prime.
It is a Duffinian number.
It is a nialpdrome in base 16.
It is a self number, because there is not a number n which added to its sum of digits gives 61139.
It is a congruent number.
261139 is an apocalyptic number.
61139 is a wasteful number, since it uses less digits than its factorization.
61139 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4716.
The square root of 61139 is about 247.2630178575. The cubic root of 61139 is about 39.3948493185.
The spelling of 61139 in words is "sixty-one thousand, one hundred thirty-nine".