194133381 has 16 divisors (see below), whose sum is σ = 279271104. Its totient is φ = 119245824.

The previous prime is 194133367. The next prime is 194133389. The reversal of 194133381 is 183331491.

194133381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 194133381 - 2⁵ = 194133349 is a prime.

It is a super-2 number, since 2×194133381² = 75375539236982322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194133389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18190 + ... + 26816.

It is an arithmetic number, because the mean of its divisors is an integer number (17454444).

Almost surely, 2^194133381 is an apocalyptic number.

It is an amenable number.

194133381 is a deficient number, since it is larger than the sum of its proper divisors (85137723).

194133381 is a wasteful number, since it uses less digits than its factorization.

194133381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9220.

The product of its digits is 7776, while the sum is 33.

The square root of 194133381 is about 13933.1755533331. The cubic root of 194133381 is about 579.0286764562.

The spelling of 194133381 in words is "one hundred ninety-four million, one hundred thirty-three thousand, three hundred eighty-one".