133502521 has 2 divisors, whose sum is σ = 133502522. Its totient is φ = 133502520.

The previous prime is 133502503. The next prime is 133502591. The reversal of 133502521 is 125205331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83997225 + 49505296 = 9165^2 + 7036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133502521 is a prime.

It is a super-2 number, since 2×133502521² = 35645846226710882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133502492 and 133502501.

It is not a weakly prime, because it can be changed into another prime (133502591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66751260 + 66751261.

It is an arithmetic number, because the mean of its divisors is an integer number (66751261).

Almost surely, 2^133502521 is an apocalyptic number.

It is an amenable number.

133502521 is a deficient number, since it is larger than the sum of its proper divisors (1).

133502521 is an equidigital number, since it uses as much as digits as its factorization.

133502521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 133502521 is about 11554.3291021158. The cubic root of 133502521 is about 511.0889471048.

Adding to 133502521 its reverse (125205331), we get a palindrome (258707852).

The spelling of 133502521 in words is "one hundred thirty-three million, five hundred two thousand, five hundred twenty-one".