133512521 has 2 divisors, whose sum is σ = 133512522. Its totient is φ = 133512520.

The previous prime is 133512479. The next prime is 133512527. The reversal of 133512521 is 125215331.

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., 100000000 + 33512521 = 10000^2 + 5789^2 .

It is a cyclic number.

It is not a de Polignac number, because 133512521 - 2²⁶ = 66403657 is a prime.

It is not a weakly prime, because it can be changed into another prime (133512527) 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, 66756260 + 66756261.

It is an arithmetic number, because the mean of its divisors is an integer number (66756261).

Almost surely, 2^133512521 is an apocalyptic number.

It is an amenable number.

133512521 is a deficient number, since it is larger than the sum of its proper divisors (1).

133512521 is an equidigital number, since it uses as much as digits as its factorization.

133512521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 23.

The square root of 133512521 is about 11554.7618322491. The cubic root of 133512521 is about 511.1017078173.

Adding to 133512521 its reverse (125215331), we get a palindrome (258727852).

The spelling of 133512521 in words is "one hundred thirty-three million, five hundred twelve thousand, five hundred twenty-one".