61005239 has 4 divisors (see below), whose sum is σ = 61027824. Its totient is φ = 60982656.

The previous prime is 61005211. The next prime is 61005247. The reversal of 61005239 is 93250016.

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 2^k-61005239 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 (61005289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6587 + ... + 12860.

It is an arithmetic number, because the mean of its divisors is an integer number (15256956).

Almost surely, 2^61005239 is an apocalyptic number.

61005239 is a deficient number, since it is larger than the sum of its proper divisors (22585).

61005239 is a wasteful number, since it uses less digits than its factorization.

61005239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22584.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 61005239 is about 7810.5850613126. The cubic root of 61005239 is about 393.6609875552.

The spelling of 61005239 in words is "sixty-one million, five thousand, two hundred thirty-nine".