33136813 has 4 divisors (see below), whose sum is σ = 34577568. Its totient is φ = 31696060.

The previous prime is 33136811. The next prime is 33136841. The reversal of 33136813 is 31863133.

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 33136813 - 2¹ = 33136811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33136811) 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, 720343 + ... + 720388.

It is an arithmetic number, because the mean of its divisors is an integer number (8644392).

Almost surely, 2^33136813 is an apocalyptic number.

It is an amenable number.

33136813 is a deficient number, since it is larger than the sum of its proper divisors (1440755).

33136813 is a wasteful number, since it uses less digits than its factorization.

33136813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440754.

The product of its digits is 3888, while the sum is 28.

The square root of 33136813 is about 5756.4583729929. The cubic root of 33136813 is about 321.1960868814.

Adding to 33136813 its reverse (31863133), we get a palindrome (64999946).

The spelling of 33136813 in words is "thirty-three million, one hundred thirty-six thousand, eight hundred thirteen".