135666531 has 108 divisors (see below), whose sum is σ = 272462736. Its totient is φ = 63296640.

The previous prime is 135666529. The next prime is 135666539.

135666531 = 226³ + 227³ + ... + 236³.

135666531 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 135666531 - 2¹ = 135666529 is a prime.

It is a super-2 number, since 2×135666531² = 36810815267147922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135666539) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 3666645 + ... + 3666681.

Almost surely, 2^135666531 is an apocalyptic number.

135666531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

135666531 is an abundant number, since it is smaller than the sum of its proper divisors (136796205).

135666531 is a wasteful number, since it uses less digits than its factorization.

135666531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 71 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 135666531 is about 11647.5976493009. The cubic root of 135666531 is about 513.8356590791.

It can be divided in two parts, 135 and 666531, that added together give a palindrome (666666).

The spelling of 135666531 in words is "one hundred thirty-five million, six hundred sixty-six thousand, five hundred thirty-one".