199971077 has 2 divisors, whose sum is σ = 199971078. Its totient is φ = 199971076.

The previous prime is 199970999. The next prime is 199971127. The reversal of 199971077 is 770179991.

It is a happy number.

199971077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (199971127) can be obtained adding 199971077 to its sum of digits (50).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103754596 + 96216481 = 10186^2 + 9809^2 .

It is a cyclic number.

It is not a de Polignac number, because 199971077 - 2¹⁴ = 199954693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199971677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99985538 + 99985539.

It is an arithmetic number, because the mean of its divisors is an integer number (99985539).

Almost surely, 2^199971077 is an apocalyptic number.

It is an amenable number.

199971077 is a deficient number, since it is larger than the sum of its proper divisors (1).

199971077 is an equidigital number, since it uses as much as digits as its factorization.

199971077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250047, while the sum is 50.

The square root of 199971077 is about 14141.1130042865. The cubic root of 199971077 is about 584.7753558285.

The spelling of 199971077 in words is "one hundred ninety-nine million, nine hundred seventy-one thousand, seventy-seven".