133980181 has 2 divisors, whose sum is σ = 133980182. Its totient is φ = 133980180.

The previous prime is 133980163. The next prime is 133980241. The reversal of 133980181 is 181089331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120253156 + 13727025 = 10966^2 + 3705^2 .

It is a cyclic number.

It is not a de Polignac number, because 133980181 - 2¹⁵ = 133947413 is a prime.

It is a super-2 number, since 2×133980181² = 35901377801585522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133920181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66990090 + 66990091.

It is an arithmetic number, because the mean of its divisors is an integer number (66990091).

Almost surely, 2^133980181 is an apocalyptic number.

It is an amenable number.

133980181 is a deficient number, since it is larger than the sum of its proper divisors (1).

133980181 is an equidigital number, since it uses as much as digits as its factorization.

133980181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 133980181 is about 11574.9808207185. The cubic root of 133980181 is about 511.6977649945.

The spelling of 133980181 in words is "one hundred thirty-three million, nine hundred eighty thousand, one hundred eighty-one".