135131540 has 12 divisors (see below), whose sum is σ = 283776276. Its totient is φ = 54052608.

The previous prime is 135131539. The next prime is 135131567. The reversal of 135131540 is 45131531.

It can be written as a sum of positive squares in 2 ways, for example, as 89946256 + 45185284 = 9484^2 + 6722^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3378269 + ... + 3378308.

It is an arithmetic number, because the mean of its divisors is an integer number (23648023).

Almost surely, 2^135131540 is an apocalyptic number.

135131540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135131540 is an abundant number, since it is smaller than the sum of its proper divisors (148644736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135131540 is a wasteful number, since it uses less digits than its factorization.

135131540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6756586 (or 6756584 counting only the distinct ones).

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

The square root of 135131540 is about 11624.6092407444. The cubic root of 135131540 is about 513.1593449070.

Subtracting from 135131540 its reverse (45131531), we obtain a palindrome (90000009).

The spelling of 135131540 in words is "one hundred thirty-five million, one hundred thirty-one thousand, five hundred forty".