135601569 has 6 divisors (see below), whose sum is σ = 195868946. Its totient is φ = 90401040.

The previous prime is 135601561. The next prime is 135601579. The reversal of 135601569 is 965106531.

135601569 is a `hidden beast` number, since 1 + 35 + 60 + 1 + 569 = 666.

It can be written as a sum of positive squares in only one way, i.e., 127983969 + 7617600 = 11313^2 + 2760^2 .

It is not a de Polignac number, because 135601569 - 2³ = 135601561 is a prime.

It is a super-2 number, since 2×135601569² = 36775571030523522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135601561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7533412 + ... + 7533429.

Almost surely, 2^135601569 is an apocalyptic number.

It is an amenable number.

135601569 is a deficient number, since it is larger than the sum of its proper divisors (60267377).

135601569 is a wasteful number, since it uses less digits than its factorization.

135601569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15066847 (or 15066844 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 135601569 is about 11644.8086716786. The cubic root of 135601569 is about 513.7536316720.

It can be divided in two parts, 13560 and 1569, that added together give a square (15129 = 123²).

The spelling of 135601569 in words is "one hundred thirty-five million, six hundred one thousand, five hundred sixty-nine".