61565 has 8 divisors (see below), whose sum is σ = 84480. Its totient is φ = 42192.

The previous prime is 61561. The next prime is 61583. The reversal of 61565 is 56516.

61565 = T₈₃ + T₈₄ + ... + T₉₇.

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

It is a cyclic number.

It is not a de Polignac number, because 61565 - 2² = 61561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61561) 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, 845 + ... + 914.

It is an arithmetic number, because the mean of its divisors is an integer number (10560).

2⁶¹⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

61565 is a deficient number, since it is larger than the sum of its proper divisors (22915).

61565 is a wasteful number, since it uses less digits than its factorization.

61565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771.

The product of its digits is 900, while the sum is 23.

The square root of 61565 is about 248.1229533921. The cubic root of 61565 is about 39.4861351756.

It can be divided in two parts, 61 and 565, that added together give a palindrome (626).

The spelling of 61565 in words is "sixty-one thousand, five hundred sixty-five".