133581338 has 24 divisors (see below), whose sum is σ = 223878900. Its totient is φ = 59716800.

The previous prime is 133581307. The next prime is 133581341. The reversal of 133581338 is 833185331.

It can be written as a sum of positive squares in 2 ways, for example, as 131629729 + 1951609 = 11473^2 + 1397^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 133581298 and 133581307.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10238 + ... + 19286.

Almost surely, 2^133581338 is an apocalyptic number.

133581338 is a deficient number, since it is larger than the sum of its proper divisors (90297562).

133581338 is a wasteful number, since it uses less digits than its factorization.

133581338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9134 (or 9123 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 133581338 is about 11557.7393118205. The cubic root of 133581338 is about 511.1895059370.

The spelling of 133581338 in words is "one hundred thirty-three million, five hundred eighty-one thousand, three hundred thirty-eight".