133801218 has 48 divisors (see below), whose sum is σ = 295134840. Its totient is φ = 43803648.

The previous prime is 133801207. The next prime is 133801267. The reversal of 133801218 is 812108331.

It can be written as a sum of positive squares in 4 ways, for example, as 126495009 + 7306209 = 11247^2 + 2703^2 .

It is a super-3 number, since 3×133801218³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 133801191 and 133801200.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 343768 + ... + 344156.

Almost surely, 2^133801218 is an apocalyptic number.

133801218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

133801218 is an abundant number, since it is smaller than the sum of its proper divisors (161333622).

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

133801218 is a wasteful number, since it uses less digits than its factorization.

133801218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 133801218 is about 11567.2476415092. The cubic root of 133801218 is about 511.4698313548.

Adding to 133801218 its reverse (812108331), we get a palindrome (945909549).

The spelling of 133801218 in words is "one hundred thirty-three million, eight hundred one thousand, two hundred eighteen".