133885813 has 4 divisors (see below), whose sum is σ = 134940160. Its totient is φ = 132831468.

The previous prime is 133885793. The next prime is 133885841. The reversal of 133885813 is 318588331.

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, and also an emirpimes, since its reverse is a distinct semiprime: 318588331 = 5303 ⋅60077.

It is a cyclic number.

It is not a de Polignac number, because 133885813 - 2²¹ = 131788661 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 (133885883) 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, 526983 + ... + 527236.

It is an arithmetic number, because the mean of its divisors is an integer number (33735040).

Almost surely, 2^133885813 is an apocalyptic number.

It is an amenable number.

133885813 is a deficient number, since it is larger than the sum of its proper divisors (1054347).

133885813 is a wasteful number, since it uses less digits than its factorization.

133885813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054346.

The product of its digits is 69120, while the sum is 40.

The square root of 133885813 is about 11570.9037244288. The cubic root of 133885813 is about 511.5775998680.

The spelling of 133885813 in words is "one hundred thirty-three million, eight hundred eighty-five thousand, eight hundred thirteen".