61569 has 6 divisors (see below), whose sum is σ = 88946. Its totient is φ = 41040.

The previous prime is 61561. The next prime is 61583. The reversal of 61569 is 96516.

It can be written as a sum of positive squares in only one way, i.e., 57600 + 3969 = 240^2 + 63^2 .

It is not a de Polignac number, because 61569 - 2³ = 61561 is a prime.

It is a super-2 number, since 2×61569² = 7581483522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

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 5 ways as a sum of consecutive naturals, for example, 3412 + ... + 3429.

2⁶¹⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

61569 is a deficient number, since it is larger than the sum of its proper divisors (27377).

61569 is a wasteful number, since it uses less digits than its factorization.

61569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6847 (or 6844 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 61569 is about 248.1310137810. The cubic root of 61569 is about 39.4869903212.

It can be divided in two parts, 61 and 569, that added together give a triangular number (630 = T₃₅).

The spelling of 61569 in words is "sixty-one thousand, five hundred sixty-nine".