194115381 has 16 divisors (see below), whose sum is σ = 272744640. Its totient is φ = 122463360.

The previous prime is 194115379. The next prime is 194115391. The reversal of 194115381 is 183511491.

It is not a de Polignac number, because 194115381 - 2¹ = 194115379 is a prime.

It is a super-2 number, since 2×194115381² = 75361562281550322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194115371) 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 15 ways as a sum of consecutive naturals, for example, 83961 + ... + 86241.

It is an arithmetic number, because the mean of its divisors is an integer number (17046540).

Almost surely, 2^194115381 is an apocalyptic number.

It is an amenable number.

194115381 is a deficient number, since it is larger than the sum of its proper divisors (78629259).

194115381 is a wasteful number, since it uses less digits than its factorization.

194115381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3796.

The product of its digits is 4320, while the sum is 33.

The square root of 194115381 is about 13932.5295980306. The cubic root of 194115381 is about 579.0107801036.

The spelling of 194115381 in words is "one hundred ninety-four million, one hundred fifteen thousand, three hundred eighty-one".