133455281 has 2 divisors, whose sum is σ = 133455282. Its totient is φ = 133455280.

The previous prime is 133455247. The next prime is 133455299. The reversal of 133455281 is 182554331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103205281 + 30250000 = 10159^2 + 5500^2 .

It is an emirp because it is prime and its reverse (182554331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133455281 is a prime.

It is a super-2 number, since 2×133455281² = 35620624053577922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (133455241) 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, 66727640 + 66727641.

It is an arithmetic number, because the mean of its divisors is an integer number (66727641).

Almost surely, 2^133455281 is an apocalyptic number.

It is an amenable number.

133455281 is a deficient number, since it is larger than the sum of its proper divisors (1).

133455281 is an equidigital number, since it uses as much as digits as its factorization.

133455281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 32.

The square root of 133455281 is about 11552.2846658139. The cubic root of 133455281 is about 511.0286568820.

The spelling of 133455281 in words is "one hundred thirty-three million, four hundred fifty-five thousand, two hundred eighty-one".