194822681 has 4 divisors (see below), whose sum is σ = 194850852. Its totient is φ = 194794512.

The previous prime is 194822671. The next prime is 194822689. The reversal of 194822681 is 186228491.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 141824281 + 52998400 = 11909^2 + 7280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194822681 is a prime.

It is a super-2 number, since 2×194822681² = 75911754064055522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194822689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4211 + ... + 20183.

It is an arithmetic number, because the mean of its divisors is an integer number (48712713).

Almost surely, 2^194822681 is an apocalyptic number.

It is an amenable number.

194822681 is a deficient number, since it is larger than the sum of its proper divisors (28171).

194822681 is a wasteful number, since it uses less digits than its factorization.

194822681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28170.

The product of its digits is 55296, while the sum is 41.

The square root of 194822681 is about 13957.8895611049. The cubic root of 194822681 is about 579.7131766527.

The spelling of 194822681 in words is "one hundred ninety-four million, eight hundred twenty-two thousand, six hundred eighty-one".