199440071 has 2 divisors, whose sum is σ = 199440072. Its totient is φ = 199440070.

The previous prime is 199440067. The next prime is 199440089. The reversal of 199440071 is 170044991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199440071 - 2² = 199440067 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199440271) 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 as a sum of consecutive naturals, namely, 99720035 + 99720036.

It is an arithmetic number, because the mean of its divisors is an integer number (99720036).

Almost surely, 2^199440071 is an apocalyptic number.

199440071 is a deficient number, since it is larger than the sum of its proper divisors (1).

199440071 is an equidigital number, since it uses as much as digits as its factorization.

199440071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 199440071 is about 14122.3252688784. The cubic root of 199440071 is about 584.2572901065.

The spelling of 199440071 in words is "one hundred ninety-nine million, four hundred forty thousand, seventy-one".