194343881 has 4 divisors (see below), whose sum is σ = 205775892. Its totient is φ = 182911872.

The previous prime is 194343857. The next prime is 194343883. The reversal of 194343881 is 188343491.

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 161671225 + 32672656 = 12715^2 + 5716^2 .

It is a cyclic number.

It is not a de Polignac number, because 194343881 - 2¹⁸ = 194081737 is a prime.

It is a super-2 number, since 2×194343881² = 75539088164284322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (194343883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5715980 + ... + 5716013.

It is an arithmetic number, because the mean of its divisors is an integer number (51443973).

Almost surely, 2^194343881 is an apocalyptic number.

It is an amenable number.

194343881 is a deficient number, since it is larger than the sum of its proper divisors (11432011).

194343881 is a wasteful number, since it uses less digits than its factorization.

194343881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11432010.

The product of its digits is 82944, while the sum is 41.

The square root of 194343881 is about 13940.7274200452. The cubic root of 194343881 is about 579.2378822928.

The spelling of 194343881 in words is "one hundred ninety-four million, three hundred forty-three thousand, eight hundred eighty-one".