194534381 has 4 divisors (see below), whose sum is σ = 199279164. Its totient is φ = 189789600.

The previous prime is 194534339. The next prime is 194534401. The reversal of 194534381 is 183435491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60762025 + 133772356 = 7795^2 + 11566^2 .

It is a cyclic number.

It is not a de Polignac number, because 194534381 - 2⁶ = 194534317 is a prime.

It is a super-2 number, since 2×194534381² = 75687250782106322, 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 (194534981) 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, 2372330 + ... + 2372411.

It is an arithmetic number, because the mean of its divisors is an integer number (49819791).

Almost surely, 2^194534381 is an apocalyptic number.

It is an amenable number.

194534381 is a deficient number, since it is larger than the sum of its proper divisors (4744783).

194534381 is an equidigital number, since it uses as much as digits as its factorization.

194534381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4744782.

The product of its digits is 51840, while the sum is 38.

The square root of 194534381 is about 13947.5582450836. The cubic root of 194534381 is about 579.4270809125.

The spelling of 194534381 in words is "one hundred ninety-four million, five hundred thirty-four thousand, three hundred eighty-one".