135591540 has 96 divisors (see below), whose sum is σ = 440100864. Its totient is φ = 30549120.

The previous prime is 135591529. The next prime is 135591553. The reversal of 135591540 is 45195531.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27547 + ... + 32093.

It is an arithmetic number, because the mean of its divisors is an integer number (4584384).

Almost surely, 2^135591540 is an apocalyptic number.

135591540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135591540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220050432).

135591540 is an abundant number, since it is smaller than the sum of its proper divisors (304509324).

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

135591540 is a wasteful number, since it uses less digits than its factorization.

135591540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4637 (or 4635 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 135591540 is about 11644.3780426436. The cubic root of 135591540 is about 513.7409657364.

The spelling of 135591540 in words is "one hundred thirty-five million, five hundred ninety-one thousand, five hundred forty".