133361521 has 4 divisors (see below), whose sum is σ = 139159872. Its totient is φ = 127563172.

The previous prime is 133361519. The next prime is 133361573. The reversal of 133361521 is 125163331.

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.

It is a cyclic number.

It is not a de Polignac number, because 133361521 - 2¹ = 133361519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133301521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2899141 + ... + 2899186.

It is an arithmetic number, because the mean of its divisors is an integer number (34789968).

Almost surely, 2^133361521 is an apocalyptic number.

It is an amenable number.

133361521 is a deficient number, since it is larger than the sum of its proper divisors (5798351).

133361521 is an equidigital number, since it uses as much as digits as its factorization.

133361521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5798350.

The product of its digits is 1620, while the sum is 25.

The square root of 133361521 is about 11548.2258810607. The cubic root of 133361521 is about 510.9089531838.

The spelling of 133361521 in words is "one hundred thirty-three million, three hundred sixty-one thousand, five hundred twenty-one".