195398977 has 2 divisors, whose sum is σ = 195398978. Its totient is φ = 195398976.

The previous prime is 195398971. The next prime is 195399011. The reversal of 195398977 is 779893591.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191434896 + 3964081 = 13836^2 + 1991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195398977 is a prime.

It is not a weakly prime, because it can be changed into another prime (195398971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97699488 + 97699489.

It is an arithmetic number, because the mean of its divisors is an integer number (97699489).

Almost surely, 2^195398977 is an apocalyptic number.

It is an amenable number.

195398977 is a deficient number, since it is larger than the sum of its proper divisors (1).

195398977 is an equidigital number, since it uses as much as digits as its factorization.

195398977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4286520, while the sum is 58.

The square root of 195398977 is about 13978.5184121923. The cubic root of 195398977 is about 580.2842215780.

The spelling of 195398977 in words is "one hundred ninety-five million, three hundred ninety-eight thousand, nine hundred seventy-seven".