133861216 has 24 divisors (see below), whose sum is σ = 272628720. Its totient is φ = 64622208.

The previous prime is 133861207. The next prime is 133861229. The reversal of 133861216 is 612168331.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71196 + ... + 73051.

It is an arithmetic number, because the mean of its divisors is an integer number (11359530).

Almost surely, 2^133861216 is an apocalyptic number.

133861216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

133861216 is an abundant number, since it is smaller than the sum of its proper divisors (138767504).

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

133861216 is a wasteful number, since it uses less digits than its factorization.

133861216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144286 (or 144278 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 133861216 is about 11569.8407940645. The cubic root of 133861216 is about 511.5462695759.

The spelling of 133861216 in words is "one hundred thirty-three million, eight hundred sixty-one thousand, two hundred sixteen".