133631436 has 12 divisors (see below), whose sum is σ = 311806712. Its totient is φ = 44543808.

The previous prime is 133631417. The next prime is 133631461. The reversal of 133631436 is 634136331.

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

It is a nude number because it is divisible by every one of its digits.

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, 5567965 + ... + 5567988.

Almost surely, 2^133631436 is an apocalyptic number.

It is an amenable number.

133631436 is an abundant number, since it is smaller than the sum of its proper divisors (178175276).

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

133631436 is a wasteful number, since it uses less digits than its factorization.

133631436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11135960 (or 11135958 counting only the distinct ones).

The product of its digits is 11664, while the sum is 30.

The square root of 133631436 is about 11559.9064010052. The cubic root of 133631436 is about 511.2534030138.

Adding to 133631436 its reverse (634136331), we get a palindrome (767767767).

The spelling of 133631436 in words is "one hundred thirty-three million, six hundred thirty-one thousand, four hundred thirty-six".