61605305 has 4 divisors (see below), whose sum is σ = 73926372. Its totient is φ = 49284240.

The previous prime is 61605289. The next prime is 61605307. The reversal of 61605305 is 50350616.

61605305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48846121 + 12759184 = 6989^2 + 3572^2 .

It is not a de Polignac number, because 61605305 - 2⁴ = 61605289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61605307) 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 3 ways as a sum of consecutive naturals, for example, 6160526 + ... + 6160535.

It is an arithmetic number, because the mean of its divisors is an integer number (18481593).

Almost surely, 2^61605305 is an apocalyptic number.

It is an amenable number.

61605305 is a deficient number, since it is larger than the sum of its proper divisors (12321067).

61605305 is a wasteful number, since it uses less digits than its factorization.

61605305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12321066.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 61605305 is about 7848.9047006573. The cubic root of 61605305 is about 394.9475014350.

The spelling of 61605305 in words is "sixty-one million, six hundred five thousand, three hundred five".