133542121 has 2 divisors, whose sum is σ = 133542122. Its totient is φ = 133542120.

The previous prime is 133542109. The next prime is 133542161. The reversal of 133542121 is 121245331.

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., 116402521 + 17139600 = 10789^2 + 4140^2 .

It is a cyclic number.

It is not a de Polignac number, because 133542121 - 2¹¹ = 133540073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 133542092 and 133542101.

It is not a weakly prime, because it can be changed into another prime (133542161) 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, 66771060 + 66771061.

It is an arithmetic number, because the mean of its divisors is an integer number (66771061).

Almost surely, 2^133542121 is an apocalyptic number.

It is an amenable number.

133542121 is a deficient number, since it is larger than the sum of its proper divisors (1).

133542121 is an equidigital number, since it uses as much as digits as its factorization.

133542121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 133542121 is about 11556.0426184745. The cubic root of 133542121 is about 511.1394757923.

Adding to 133542121 its reverse (121245331), we get a palindrome (254787452).

The spelling of 133542121 in words is "one hundred thirty-three million, five hundred forty-two thousand, one hundred twenty-one".