135131252 has 18 divisors (see below), whose sum is σ = 243053622. Its totient is φ = 65736864.

The previous prime is 135131237. The next prime is 135131273. The reversal of 135131252 is 252131531.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 100721296 + 34409956 = 10036^2 + 5866^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6863 + ... + 17814.

It is an arithmetic number, because the mean of its divisors is an integer number (13502979).

Almost surely, 2^135131252 is an apocalyptic number.

It is an amenable number.

135131252 is a deficient number, since it is larger than the sum of its proper divisors (107922370).

135131252 is a wasteful number, since it uses less digits than its factorization.

135131252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24755 (or 24716 counting only the distinct ones).

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

The square root of 135131252 is about 11624.5968532246. The cubic root of 135131252 is about 513.1589803487.

Adding to 135131252 its reverse (252131531), we get a palindrome (387262783).

The spelling of 135131252 in words is "one hundred thirty-five million, one hundred thirty-one thousand, two hundred fifty-two".