133213813 has 4 divisors (see below), whose sum is σ = 135397708. Its totient is φ = 131029920.

The previous prime is 133213793. The next prime is 133213867. The reversal of 133213813 is 318312331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74338884 + 58874929 = 8622^2 + 7673^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133213813 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 (133216813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1091856 + ... + 1091977.

It is an arithmetic number, because the mean of its divisors is an integer number (33849427).

Almost surely, 2^133213813 is an apocalyptic number.

It is an amenable number.

133213813 is a deficient number, since it is larger than the sum of its proper divisors (2183895).

133213813 is an equidigital number, since it uses as much as digits as its factorization.

133213813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183894.

The product of its digits is 1296, while the sum is 25.

The square root of 133213813 is about 11541.8288412192. The cubic root of 133213813 is about 510.7202600299.

The spelling of 133213813 in words is "one hundred thirty-three million, two hundred thirteen thousand, eight hundred thirteen".