133733521 has 2 divisors, whose sum is σ = 133733522. Its totient is φ = 133733520.

The previous prime is 133733461. The next prime is 133733527. The reversal of 133733521 is 125337331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70308225 + 63425296 = 8385^2 + 7964^2 .

It is a cyclic number.

It is not a de Polignac number, because 133733521 - 2¹⁵ = 133700753 is a prime.

It is a super-3 number, since 3×133733521³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133733521.

It is not a weakly prime, because it can be changed into another prime (133733527) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66866760 + 66866761.

It is an arithmetic number, because the mean of its divisors is an integer number (66866761).

Almost surely, 2^133733521 is an apocalyptic number.

It is an amenable number.

133733521 is a deficient number, since it is larger than the sum of its proper divisors (1).

133733521 is an equidigital number, since it uses as much as digits as its factorization.

133733521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 28.

The square root of 133733521 is about 11564.3210349765. The cubic root of 133733521 is about 511.3835570670.

The spelling of 133733521 in words is "one hundred thirty-three million, seven hundred thirty-three thousand, five hundred twenty-one".