133511232 has 28 divisors (see below), whose sum is σ = 353248976. Its totient is φ = 44503680.

The previous prime is 133511221. The next prime is 133511239. The reversal of 133511232 is 232115331.

It is a junction number, because it is equal to n+sod(n) for n = 133511199 and 133511208.

It is not an unprimeable number, because it can be changed into a prime (133511239) 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, 347494 + ... + 347877.

Almost surely, 2^133511232 is an apocalyptic number.

133511232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

133511232 is an abundant number, since it is smaller than the sum of its proper divisors (219737744).

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

133511232 is an equidigital number, since it uses as much as digits as its factorization.

133511232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695386 (or 695376 counting only the distinct ones).

The product of its digits is 540, while the sum is 21.

The square root of 133511232 is about 11554.7060542447. The cubic root of 133511232 is about 511.1000629972.

Adding to 133511232 its reverse (232115331), we get a palindrome (365626563).

The spelling of 133511232 in words is "one hundred thirty-three million, five hundred eleven thousand, two hundred thirty-two".