133613523 has 32 divisors (see below), whose sum is σ = 211821120. Its totient is φ = 82944000.

The previous prime is 133613507. The next prime is 133613537. The reversal of 133613523 is 325316331.

It is a happy number.

133613523 is a `hidden beast` number, since 133 + 6 + 1 + 3 + 523 = 666.

It is not a de Polignac number, because 133613523 - 2⁴ = 133613507 is a prime.

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 (133613593) 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 31 ways as a sum of consecutive naturals, for example, 43023 + ... + 46023.

It is an arithmetic number, because the mean of its divisors is an integer number (6619410).

Almost surely, 2^133613523 is an apocalyptic number.

133613523 is a deficient number, since it is larger than the sum of its proper divisors (78207597).

133613523 is a wasteful number, since it uses less digits than its factorization.

133613523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3124 (or 3118 counting only the distinct ones).

The product of its digits is 4860, while the sum is 27.

The square root of 133613523 is about 11559.1315850283. The cubic root of 133613523 is about 511.2305578616.

Adding to 133613523 its reverse (325316331), we get a palindrome (458929854).

The spelling of 133613523 in words is "one hundred thirty-three million, six hundred thirteen thousand, five hundred twenty-three".