133557538 has 8 divisors (see below), whose sum is σ = 200423340. Its totient is φ = 66749760.

The previous prime is 133557511. The next prime is 133557563. The reversal of 133557538 is 835755331.

It can be written as a sum of positive squares in 2 ways, for example, as 100460529 + 33097009 = 10023^2 + 5753^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 133557538.

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, 8203 + ... + 18286.

Almost surely, 2^133557538 is an apocalyptic number.

133557538 is a deficient number, since it is larger than the sum of its proper divisors (66865802).

133557538 is a wasteful number, since it uses less digits than its factorization.

133557538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29012.

The product of its digits is 189000, while the sum is 40.

The square root of 133557538 is about 11556.7096528380. The cubic root of 133557538 is about 511.1591448276.

The spelling of 133557538 in words is "one hundred thirty-three million, five hundred fifty-seven thousand, five hundred thirty-eight".