133403521 has 2 divisors, whose sum is σ = 133403522. Its totient is φ = 133403520.

The previous prime is 133403507. The next prime is 133403549. The reversal of 133403521 is 125304331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94478400 + 38925121 = 9720^2 + 6239^2 .

It is a cyclic number.

It is not a de Polignac number, because 133403521 - 2¹¹ = 133401473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 133403492 and 133403501.

It is not a weakly prime, because it can be changed into another prime (133403561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66701760 + 66701761.

It is an arithmetic number, because the mean of its divisors is an integer number (66701761).

Almost surely, 2^133403521 is an apocalyptic number.

It is an amenable number.

133403521 is a deficient number, since it is larger than the sum of its proper divisors (1).

133403521 is an equidigital number, since it uses as much as digits as its factorization.

133403521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 133403521 is about 11550.0441990496. The cubic root of 133403521 is about 510.9625816558.

Adding to 133403521 its reverse (125304331), we get a palindrome (258707852).

It can be divided in two parts, 13340 and 3521, that added together give a palindrome (16861).

The spelling of 133403521 in words is "one hundred thirty-three million, four hundred three thousand, five hundred twenty-one".