133358381 has 4 divisors (see below), whose sum is σ = 143616732. Its totient is φ = 123100032.

The previous prime is 133358369. The next prime is 133358389. The reversal of 133358381 is 183853331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183853331 = 47 ⋅3911773.

It can be written as a sum of positive squares in 2 ways, for example, as 46104100 + 87254281 = 6790^2 + 9341^2 .

It is a cyclic number.

It is not a de Polignac number, because 133358381 - 2¹⁴ = 133341997 is a prime.

It is a super-2 number, since 2×133358381² = 35568915565882322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133358389) 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, 5129156 + ... + 5129181.

It is an arithmetic number, because the mean of its divisors is an integer number (35904183).

Almost surely, 2^133358381 is an apocalyptic number.

It is an amenable number.

133358381 is a deficient number, since it is larger than the sum of its proper divisors (10258351).

133358381 is a wasteful number, since it uses less digits than its factorization.

133358381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10258350.

The product of its digits is 25920, while the sum is 35.

The square root of 133358381 is about 11548.0899286419. The cubic root of 133358381 is about 510.9049433647.

The spelling of 133358381 in words is "one hundred thirty-three million, three hundred fifty-eight thousand, three hundred eighty-one".