133920218 has 4 divisors (see below), whose sum is σ = 200880330. Its totient is φ = 66960108.

The previous prime is 133920211. The next prime is 133920233. The reversal of 133920218 is 812029331.

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., 115197289 + 18722929 = 10733^2 + 4327^2 .

It is not an unprimeable number, because it can be changed into a prime (133920211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33480053 + ... + 33480056.

Almost surely, 2^133920218 is an apocalyptic number.

133920218 is a deficient number, since it is larger than the sum of its proper divisors (66960112).

133920218 is an equidigital number, since it uses as much as digits as its factorization.

133920218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66960111.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 133920218 is about 11572.3903321656. The cubic root of 133920218 is about 511.6214166088.

Adding to 133920218 its reverse (812029331), we get a palindrome (945949549).

The spelling of 133920218 in words is "one hundred thirty-three million, nine hundred twenty thousand, two hundred eighteen".