135251532 has 120 divisors (see below), whose sum is σ = 385052976. Its totient is φ = 41150592.

The previous prime is 135251513. The next prime is 135251533. The reversal of 135251532 is 235152531.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 135251496 and 135251505.

It is not an unprimeable number, because it can be changed into a prime (135251533) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 686458 + ... + 686654.

Almost surely, 2^135251532 is an apocalyptic number.

135251532 is a gapful number since it is divisible by the number (12) 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 135251532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192526488).

135251532 is an abundant number, since it is smaller than the sum of its proper divisors (249801444).

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

135251532 is a wasteful number, since it uses less digits than its factorization.

135251532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 378 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 135251532 is about 11629.7692152510. The cubic root of 135251532 is about 513.3111890524.

Subtracting 135251532 from its reverse (235152531), we obtain a palindrome (99900999).

The spelling of 135251532 in words is "one hundred thirty-five million, two hundred fifty-one thousand, five hundred thirty-two".