199971677 has 2 divisors, whose sum is σ = 199971678. Its totient is φ = 199971676.

The previous prime is 199971671. The next prime is 199971691. The reversal of 199971677 is 776179991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171976996 + 27994681 = 13114^2 + 5291^2 .

It is a cyclic number.

It is not a de Polignac number, because 199971677 - 2⁶ = 199971613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199971671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99985838 + 99985839.

It is an arithmetic number, because the mean of its divisors is an integer number (99985839).

Almost surely, 2^199971677 is an apocalyptic number.

It is an amenable number.

199971677 is a deficient number, since it is larger than the sum of its proper divisors (1).

199971677 is an equidigital number, since it uses as much as digits as its factorization.

199971677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1500282, while the sum is 56.

The square root of 199971677 is about 14141.1342190080. The cubic root of 199971677 is about 584.7759406879.

The spelling of 199971677 in words is "one hundred ninety-nine million, nine hundred seventy-one thousand, six hundred seventy-seven".