133861518 has 128 divisors (see below), whose sum is σ = 360806400. Its totient is φ = 35963136.

The previous prime is 133861459. The next prime is 133861531. The reversal of 133861518 is 815168331.

133861518 is a `hidden beast` number, since 1 + 3 + 38 + 615 + 1 + 8 = 666.

133861518 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 773680 + ... + 773852.

It is an arithmetic number, because the mean of its divisors is an integer number (2818800).

Almost surely, 2^133861518 is an apocalyptic number.

133861518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 133861518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180403200).

133861518 is an abundant number, since it is smaller than the sum of its proper divisors (226944882).

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

133861518 is a wasteful number, since it uses less digits than its factorization.

133861518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 297 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 133861518 is about 11569.8538452307. The cubic root of 133861518 is about 511.5466542700.

The spelling of 133861518 in words is "one hundred thirty-three million, eight hundred sixty-one thousand, five hundred eighteen".