133521232 has 20 divisors (see below), whose sum is σ = 278597620. Its totient is φ = 61625088.

The previous prime is 133521229. The next prime is 133521259. The reversal of 133521232 is 232125331.

It can be written as a sum of positive squares in 2 ways, for example, as 5740816 + 127780416 = 2396^2 + 11304^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320757 + ... + 321172.

It is an arithmetic number, because the mean of its divisors is an integer number (13929881).

Almost surely, 2^133521232 is an apocalyptic number.

It is an amenable number.

133521232 is an abundant number, since it is smaller than the sum of its proper divisors (145076388).

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

133521232 is a wasteful number, since it uses less digits than its factorization.

133521232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641950 (or 641944 counting only the distinct ones).

The product of its digits is 1080, while the sum is 22.

The square root of 133521232 is about 11555.1387702615. The cubic root of 133521232 is about 511.1128231547.

Adding to 133521232 its reverse (232125331), we get a palindrome (365646563).

The spelling of 133521232 in words is "one hundred thirty-three million, five hundred twenty-one thousand, two hundred thirty-two".