61020565 has 16 divisors (see below), whose sum is σ = 78230448. Its totient is φ = 45531136.

The previous prime is 61020559. The next prime is 61020577. The reversal of 61020565 is 56502016.

61020565 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 8 ways, for example, as 4334724 + 56685841 = 2082^2 + 7529^2 .

It is a cyclic number.

It is not a de Polignac number, because 61020565 - 2¹³ = 61012373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6429 + ... + 12781.

It is an arithmetic number, because the mean of its divisors is an integer number (4889403).

Almost surely, 2^61020565 is an apocalyptic number.

It is an amenable number.

61020565 is a deficient number, since it is larger than the sum of its proper divisors (17209883).

61020565 is a wasteful number, since it uses less digits than its factorization.

61020565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6488.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 61020565 is about 7811.5661041817. The cubic root of 61020565 is about 393.6939505337.

The spelling of 61020565 in words is "sixty-one million, twenty thousand, five hundred sixty-five".