61739 has 4 divisors (see below), whose sum is σ = 62424. Its totient is φ = 61056.

The previous prime is 61729. The next prime is 61751. The reversal of 61739 is 93716.

It is a happy number.

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 61739 - 2⁴ = 61723 is a prime.

It is a Duffinian number.

It is a plaindrome in base 7 and base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 61739.

It is not an unprimeable number, because it can be changed into a prime (61729) 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, 182 + ... + 395.

It is an arithmetic number, because the mean of its divisors is an integer number (15606).

2⁶¹⁷³⁹ is an apocalyptic number.

61739 is a deficient number, since it is larger than the sum of its proper divisors (685).

61739 is a wasteful number, since it uses less digits than its factorization.

61739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684.

The product of its digits is 1134, while the sum is 26.

The square root of 61739 is about 248.4733386100. The cubic root of 61739 is about 39.5232998250.

It can be divided in two parts, 617 and 39, that added together give a palindrome (656).

The spelling of 61739 in words is "sixty-one thousand, seven hundred thirty-nine".