133081818 has 64 divisors (see below), whose sum is σ = 291658752. Its totient is φ = 40360320.

The previous prime is 133081811. The next prime is 133081849. The reversal of 133081818 is 818180331.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (133081811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243021 + ... + 243567.

It is an arithmetic number, because the mean of its divisors is an integer number (4557168).

Almost surely, 2^133081818 is an apocalyptic number.

133081818 is an abundant number, since it is smaller than the sum of its proper divisors (158576934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133081818 is a wasteful number, since it uses less digits than its factorization.

133081818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 133081818 is about 11536.1093094682. The cubic root of 133081818 is about 510.5515217769.

The spelling of 133081818 in words is "one hundred thirty-three million, eighty-one thousand, eight hundred eighteen".