133521499 has 2 divisors, whose sum is σ = 133521500. Its totient is φ = 133521498.

The previous prime is 133521439. The next prime is 133521517. The reversal of 133521499 is 994125331.

It is a strong prime.

It is an emirp because it is prime and its reverse (994125331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133521499 - 2⁹ = 133520987 is a prime.

It is equal to p_7566472 and since 133521499 and 7566472 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (133521439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66760749 + 66760750.

It is an arithmetic number, because the mean of its divisors is an integer number (66760750).

Almost surely, 2^133521499 is an apocalyptic number.

133521499 is a deficient number, since it is larger than the sum of its proper divisors (1).

133521499 is an equidigital number, since it uses as much as digits as its factorization.

133521499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 37.

The square root of 133521499 is about 11555.1503235570. The cubic root of 133521499 is about 511.1131638421.

The spelling of 133521499 in words is "one hundred thirty-three million, five hundred twenty-one thousand, four hundred ninety-nine".