133452521 has 4 divisors (see below), whose sum is σ = 136556112. Its totient is φ = 130348932.

The previous prime is 133452497. The next prime is 133452547. The reversal of 133452521 is 125254331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125254331 = 977 ⋅128203.

It is a cyclic number.

It is not a de Polignac number, because 133452521 - 2⁶ = 133452457 is a prime.

It is a super-2 number, since 2×133452521² = 35619150722510882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133457521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1551731 + ... + 1551816.

It is an arithmetic number, because the mean of its divisors is an integer number (34139028).

Almost surely, 2^133452521 is an apocalyptic number.

It is an amenable number.

133452521 is a deficient number, since it is larger than the sum of its proper divisors (3103591).

133452521 is an equidigital number, since it uses as much as digits as its factorization.

133452521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103590.

The product of its digits is 3600, while the sum is 26.

The square root of 133452521 is about 11552.1652083062. The cubic root of 133452521 is about 511.0251339820.

The spelling of 133452521 in words is "one hundred thirty-three million, four hundred fifty-two thousand, five hundred twenty-one".