133706161 has 4 divisors (see below), whose sum is σ = 133797924. Its totient is φ = 133614400.

The previous prime is 133706147. The next prime is 133706171. The reversal of 133706161 is 161607331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161607331 = 19 ⋅8505649.

It can be written as a sum of positive squares in 2 ways, for example, as 64899136 + 68807025 = 8056^2 + 8295^2 .

It is a cyclic number.

It is not a de Polignac number, because 133706161 - 2⁷ = 133706033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133706101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43660 + ... + 46621.

It is an arithmetic number, because the mean of its divisors is an integer number (33449481).

Almost surely, 2^133706161 is an apocalyptic number.

It is an amenable number.

133706161 is a deficient number, since it is larger than the sum of its proper divisors (91763).

133706161 is an equidigital number, since it uses as much as digits as its factorization.

133706161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91762.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 133706161 is about 11563.1380256399. The cubic root of 133706161 is about 511.3486807242.

The spelling of 133706161 in words is "one hundred thirty-three million, seven hundred six thousand, one hundred sixty-one".