133705881 has 6 divisors (see below), whose sum is σ = 193130730. Its totient is φ = 89137248.

The previous prime is 133705853. The next prime is 133705889. The reversal of 133705881 is 188507331.

133705881 is a `hidden beast` number, since 1 + 3 + 3 + 70 + 588 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 128936025 + 4769856 = 11355^2 + 2184^2 .

It is not a de Polignac number, because 133705881 - 2⁵ = 133705849 is a prime.

It is a super-2 number, since 2×133705881² = 35754525227972322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (133705889) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7428096 + ... + 7428113.

It is an arithmetic number, because the mean of its divisors is an integer number (32188455).

Almost surely, 2^133705881 is an apocalyptic number.

It is an amenable number.

133705881 is a deficient number, since it is larger than the sum of its proper divisors (59424849).

133705881 is a wasteful number, since it uses less digits than its factorization.

133705881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14856215 (or 14856212 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 133705881 is about 11563.1259181936. The cubic root of 133705881 is about 511.3483237780.

The spelling of 133705881 in words is "one hundred thirty-three million, seven hundred five thousand, eight hundred eighty-one".