133145521 has 8 divisors (see below), whose sum is σ = 140260320. Its totient is φ = 126041472.

The previous prime is 133145473. The next prime is 133145539. The reversal of 133145521 is 125541331.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133145521 - 2⁷ = 133145393 is a prime.

It is a super-2 number, since 2×133145521² = 35455459524722882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133145021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41646 + ... + 44728.

It is an arithmetic number, because the mean of its divisors is an integer number (17532540).

Almost surely, 2^133145521 is an apocalyptic number.

It is an amenable number.

133145521 is a deficient number, since it is larger than the sum of its proper divisors (7114799).

133145521 is a wasteful number, since it uses less digits than its factorization.

133145521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5375.

The product of its digits is 1800, while the sum is 25.

The square root of 133145521 is about 11538.8700053341. The cubic root of 133145521 is about 510.6329716099.

Adding to 133145521 its reverse (125541331), we get a palindrome (258686852).

The spelling of 133145521 in words is "one hundred thirty-three million, one hundred forty-five thousand, five hundred twenty-one".