61905065 has 8 divisors (see below), whose sum is σ = 74345928. Its totient is φ = 49484160.

The previous prime is 61905061. The next prime is 61905073. The reversal of 61905065 is 56050916.

61905065 = 5563² + 5564².

It can be written as a sum of positive squares in 4 ways, for example, as 21353641 + 40551424 = 4621^2 + 6368^2 .

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

It is not a de Polignac number, because 61905065 - 2² = 61905061 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61905061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3005 + ... + 11525.

It is an arithmetic number, because the mean of its divisors is an integer number (9293241).

Almost surely, 2^61905065 is an apocalyptic number.

61905065 is the 5564-th centered square number.

It is an amenable number.

61905065 is a deficient number, since it is larger than the sum of its proper divisors (12440863).

61905065 is a wasteful number, since it uses less digits than its factorization.

61905065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9979.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 61905065 is about 7867.9771860371. The cubic root of 61905065 is about 395.5870457081.

The spelling of 61905065 in words is "sixty-one million, nine hundred five thousand, sixty-five".