231135252 has 12 divisors (see below), whose sum is σ = 539315616. Its totient is φ = 77045080.

The previous prime is 231135239. The next prime is 231135253. The reversal of 231135252 is 252531132.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231135253) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9630624 + ... + 9630647.

It is an arithmetic number, because the mean of its divisors is an integer number (44942968).

Almost surely, 2^231135252 is an apocalyptic number.

It is an amenable number.

231135252 is an abundant number, since it is smaller than the sum of its proper divisors (308180364).

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

231135252 is a wasteful number, since it uses less digits than its factorization.

231135252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19261278 (or 19261276 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 231135252 is about 15203.1329665961. The cubic root of 231135252 is about 613.6989721459.

Adding to 231135252 its reverse (252531132), we get a palindrome (483666384).

The spelling of 231135252 in words is "two hundred thirty-one million, one hundred thirty-five thousand, two hundred fifty-two".