195830977 has 2 divisors, whose sum is σ = 195830978. Its totient is φ = 195830976.

The previous prime is 195830927. The next prime is 195830989. The reversal of 195830977 is 779038591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152744881 + 43086096 = 12359^2 + 6564^2 .

It is an emirp because it is prime and its reverse (779038591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195830977 - 2¹¹ = 195828929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195830977.

It is not a weakly prime, because it can be changed into another prime (195830917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97915488 + 97915489.

It is an arithmetic number, because the mean of its divisors is an integer number (97915489).

Almost surely, 2^195830977 is an apocalyptic number.

It is an amenable number.

195830977 is a deficient number, since it is larger than the sum of its proper divisors (1).

195830977 is an equidigital number, since it uses as much as digits as its factorization.

195830977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 49.

The square root of 195830977 is about 13993.9621623041. The cubic root of 195830977 is about 580.7115494186.

The spelling of 195830977 in words is "one hundred ninety-five million, eight hundred thirty thousand, nine hundred seventy-seven".