133833381 has 24 divisors (see below), whose sum is σ = 196997472. Its totient is φ = 80818320.

The previous prime is 133833379. The next prime is 133833407. The reversal of 133833381 is 183338331.

It is not a de Polignac number, because 133833381 - 2¹ = 133833379 is a prime.

It is a super-2 number, since 2×133833381² = 35822747739782322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133837381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 483015 + ... + 483291.

It is an arithmetic number, because the mean of its divisors is an integer number (8208228).

Almost surely, 2^133833381 is an apocalyptic number.

133833381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133833381 is a deficient number, since it is larger than the sum of its proper divisors (63164091).

133833381 is an frugal number, since it uses more digits than its factorization.

133833381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 291 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 133833381 is about 11568.6378195533. The cubic root of 133833381 is about 511.5108102699.

The spelling of 133833381 in words is "one hundred thirty-three million, eight hundred thirty-three thousand, three hundred eighty-one".