133137538 has 4 divisors (see below), whose sum is σ = 199706310. Its totient is φ = 66568768.

The previous prime is 133137517. The next prime is 133137539. The reversal of 133137538 is 835731331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 835731331 = 41 ⋅20383691.

It can be written as a sum of positive squares in only one way, i.e., 133010089 + 127449 = 11533^2 + 357^2 .

It is not an unprimeable number, because it can be changed into a prime (133137539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33284383 + ... + 33284386.

Almost surely, 2^133137538 is an apocalyptic number.

133137538 is a deficient number, since it is larger than the sum of its proper divisors (66568772).

133137538 is an equidigital number, since it uses as much as digits as its factorization.

133137538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66568771.

The product of its digits is 22680, while the sum is 34.

The square root of 133137538 is about 11538.5240823946. The cubic root of 133137538 is about 510.6227660733.

Adding to 133137538 its reverse (835731331), we get a palindrome (968868869).

The spelling of 133137538 in words is "one hundred thirty-three million, one hundred thirty-seven thousand, five hundred thirty-eight".