133439081 has 2 divisors, whose sum is σ = 133439082. Its totient is φ = 133439080.

The previous prime is 133439029. The next prime is 133439083. The reversal of 133439081 is 180934331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114811225 + 18627856 = 10715^2 + 4316^2 .

It is an emirp because it is prime and its reverse (180934331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133439081 - 2¹⁸ = 133176937 is a prime.

It is a super-2 number, since 2×133439081² = 35611976676249122, which contains 22 as substring.

Together with 133439083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133439083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66719540 + 66719541.

It is an arithmetic number, because the mean of its divisors is an integer number (66719541).

Almost surely, 2^133439081 is an apocalyptic number.

It is an amenable number.

133439081 is a deficient number, since it is larger than the sum of its proper divisors (1).

133439081 is an equidigital number, since it uses as much as digits as its factorization.

133439081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 133439081 is about 11551.5834845271. The cubic root of 133439081 is about 511.0079782967.

The spelling of 133439081 in words is "one hundred thirty-three million, four hundred thirty-nine thousand, eighty-one".