61305865 has 8 divisors (see below), whose sum is σ = 75361608. Its totient is φ = 47848320.

The previous prime is 61305847. The next prime is 61305869. The reversal of 61305865 is 56850316.

61305865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1026169 + 60279696 = 1013^2 + 7764^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61305865 - 2¹¹ = 61303817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61305865.

It is not an unprimeable number, because it can be changed into a prime (61305869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149322 + ... + 149731.

It is an arithmetic number, because the mean of its divisors is an integer number (9420201).

Almost surely, 2^61305865 is an apocalyptic number.

It is an amenable number.

61305865 is a deficient number, since it is larger than the sum of its proper divisors (14055743).

61305865 is a wasteful number, since it uses less digits than its factorization.

61305865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299099.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 61305865 is about 7829.8061917266. The cubic root of 61305865 is about 394.3065652387.

The spelling of 61305865 in words is "sixty-one million, three hundred five thousand, eight hundred sixty-five".