133555213 has 8 divisors (see below), whose sum is σ = 154267200. Its totient is φ = 114271680.

The previous prime is 133555207. The next prime is 133555243. The reversal of 133555213 is 312555331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133555213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133555243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356913 + ... + 357286.

It is an arithmetic number, because the mean of its divisors is an integer number (19283400).

Almost surely, 2^133555213 is an apocalyptic number.

It is an amenable number.

133555213 is a deficient number, since it is larger than the sum of its proper divisors (20711987).

133555213 is a wasteful number, since it uses less digits than its factorization.

133555213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714227.

The product of its digits is 6750, while the sum is 28.

The square root of 133555213 is about 11556.6090614851. The cubic root of 133555213 is about 511.1561786855.

The spelling of 133555213 in words is "one hundred thirty-three million, five hundred fifty-five thousand, two hundred thirteen".