194698081 has 4 divisors (see below), whose sum is σ = 197365252. Its totient is φ = 192030912.

The previous prime is 194698069. The next prime is 194698177. The reversal of 194698081 is 180896491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180896491 = 79 ⋅2289829.

It can be written as a sum of positive squares in 2 ways, for example, as 160883856 + 33814225 = 12684^2 + 5815^2 .

It is a cyclic number.

It is not a de Polignac number, because 194698081 - 2⁷ = 194697953 is a prime.

It is a super-2 number, since 2×194698081² = 75814685490165122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194698061) 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, 1333476 + ... + 1333621.

It is an arithmetic number, because the mean of its divisors is an integer number (49341313).

Almost surely, 2^194698081 is an apocalyptic number.

It is an amenable number.

194698081 is a deficient number, since it is larger than the sum of its proper divisors (2667171).

194698081 is an equidigital number, since it uses as much as digits as its factorization.

194698081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2667170.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 194698081 is about 13953.4254217378. The cubic root of 194698081 is about 579.5895639642.

The spelling of 194698081 in words is "one hundred ninety-four million, six hundred ninety-eight thousand, eighty-one".