133513633 has 4 divisors (see below), whose sum is σ = 145651248. Its totient is φ = 121376020.

The previous prime is 133513607. The next prime is 133513657. The reversal of 133513633 is 336315331.

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 a de Polignac number, because none of the positive numbers 2^k-133513633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133513663) 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, 6068791 + ... + 6068812.

It is an arithmetic number, because the mean of its divisors is an integer number (36412812).

Almost surely, 2^133513633 is an apocalyptic number.

It is an amenable number.

133513633 is a deficient number, since it is larger than the sum of its proper divisors (12137615).

133513633 is a wasteful number, since it uses less digits than its factorization.

133513633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12137614.

The product of its digits is 7290, while the sum is 28.

The square root of 133513633 is about 11554.8099508387. The cubic root of 133513633 is about 511.1031267691.

Adding to 133513633 its reverse (336315331), we get a palindrome (469828964).

The spelling of 133513633 in words is "one hundred thirty-three million, five hundred thirteen thousand, six hundred thirty-three".