133147906 has 4 divisors (see below), whose sum is σ = 199721862. Its totient is φ = 66573952.

The previous prime is 133147873. The next prime is 133147919. The reversal of 133147906 is 609741331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 88190881 + 44957025 = 9391^2 + 6705^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33286975 + ... + 33286978.

Almost surely, 2^133147906 is an apocalyptic number.

133147906 is a deficient number, since it is larger than the sum of its proper divisors (66573956).

133147906 is an equidigital number, since it uses as much as digits as its factorization.

133147906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66573955.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 133147906 is about 11538.9733512128. The cubic root of 133147906 is about 510.6360205355.

The spelling of 133147906 in words is "one hundred thirty-three million, one hundred forty-seven thousand, nine hundred six".