133911181 has 2 divisors, whose sum is σ = 133911182. Its totient is φ = 133911180.

The previous prime is 133911163. The next prime is 133911191. The reversal of 133911181 is 181119331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86769225 + 47141956 = 9315^2 + 6866^2 .

It is an emirp because it is prime and its reverse (181119331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133911181 - 2⁵ = 133911149 is a prime.

It is a super-2 number, since 2×133911181² = 35864408793629522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133911101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66955590 + 66955591.

It is an arithmetic number, because the mean of its divisors is an integer number (66955591).

Almost surely, 2^133911181 is an apocalyptic number.

It is an amenable number.

133911181 is a deficient number, since it is larger than the sum of its proper divisors (1).

133911181 is an equidigital number, since it uses as much as digits as its factorization.

133911181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 28.

The square root of 133911181 is about 11571.9998703768. Note that the first 3 decimals coincide. The cubic root of 133911181 is about 511.6099081977.

The spelling of 133911181 in words is "one hundred thirty-three million, nine hundred eleven thousand, one hundred eighty-one".