191444081 has 2 divisors, whose sum is σ = 191444082. Its totient is φ = 191444080.

The previous prime is 191444059. The next prime is 191444093. The reversal of 191444081 is 180444191.

191444081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181306225 + 10137856 = 13465^2 + 3184^2 .

It is a cyclic number.

It is not a de Polignac number, because 191444081 - 2¹⁸ = 191181937 is a prime.

It is a super-2 number, since 2×191444081² = 73301672299869122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (191444381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95722040 + 95722041.

It is an arithmetic number, because the mean of its divisors is an integer number (95722041).

Almost surely, 2^191444081 is an apocalyptic number.

It is an amenable number.

191444081 is a deficient number, since it is larger than the sum of its proper divisors (1).

191444081 is an equidigital number, since it uses as much as digits as its factorization.

191444081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 191444081 is about 13836.3319199852. The cubic root of 191444081 is about 576.3425024231.

The spelling of 191444081 in words is "one hundred ninety-one million, four hundred forty-four thousand, eighty-one".