133345521 has 24 divisors (see below), whose sum is σ = 205156224. Its totient is φ = 86488560.

The previous prime is 133345519. The next prime is 133345543. The reversal of 133345521 is 125543331.

133345521 is a `hidden beast` number, since 133 + 3 + 4 + 5 + 521 = 666.

It is not a de Polignac number, because 133345521 - 2¹ = 133345519 is a prime.

It is a super-2 number, since 2×133345521² = 35562055941522882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (133345561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1576 + ... + 16406.

It is an arithmetic number, because the mean of its divisors is an integer number (8548176).

Almost surely, 2^133345521 is an apocalyptic number.

It is an amenable number.

133345521 is a deficient number, since it is larger than the sum of its proper divisors (71810703).

133345521 is an equidigital number, since it uses as much as digits as its factorization.

133345521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14883 (or 14871 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 133345521 is about 11547.5331131805. The cubic root of 133345521 is about 510.8885203280. Note that the first 3 decimals are identical.

Adding to 133345521 its reverse (125543331), we get a palindrome (258888852).

The spelling of 133345521 in words is "one hundred thirty-three million, three hundred forty-five thousand, five hundred twenty-one".