133206181 has 2 divisors, whose sum is σ = 133206182. Its totient is φ = 133206180.

The previous prime is 133206167. The next prime is 133206187. The reversal of 133206181 is 181602331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96845281 + 36360900 = 9841^2 + 6030^2 .

It is an emirp because it is prime and its reverse (181602331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133206181 - 2⁷ = 133206053 is a prime.

It is a super-2 number, since 2×133206181² = 35487773313209522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133206187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66603090 + 66603091.

It is an arithmetic number, because the mean of its divisors is an integer number (66603091).

Almost surely, 2^133206181 is an apocalyptic number.

It is an amenable number.

133206181 is a deficient number, since it is larger than the sum of its proper divisors (1).

133206181 is an equidigital number, since it uses as much as digits as its factorization.

133206181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 133206181 is about 11541.4982129704. The cubic root of 133206181 is about 510.7105065582.

The spelling of 133206181 in words is "one hundred thirty-three million, two hundred six thousand, one hundred eighty-one".