135565531 has 16 divisors (see below), whose sum is σ = 147308544. Its totient is φ = 124269184.

The previous prime is 135565523. The next prime is 135565537.

135565531 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 135565531 - 2³ = 135565523 is a prime.

It is a super-2 number, since 2×135565531² = 36756026390623922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135565537) 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 15 ways as a sum of consecutive naturals, for example, 305796 + ... + 306238.

It is an arithmetic number, because the mean of its divisors is an integer number (9206784).

Almost surely, 2^135565531 is an apocalyptic number.

135565531 is a deficient number, since it is larger than the sum of its proper divisors (11743013).

135565531 is a wasteful number, since it uses less digits than its factorization.

135565531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890.

The product of its digits is 33750, while the sum is 34.

The square root of 135565531 is about 11643.2611840498. The cubic root of 135565531 is about 513.7081152522.

The spelling of 135565531 in words is "one hundred thirty-five million, five hundred sixty-five thousand, five hundred thirty-one".