195191897 has 2 divisors, whose sum is σ = 195191898. Its totient is φ = 195191896.

The previous prime is 195191881. The next prime is 195191947. The reversal of 195191897 is 798191591.

It is an a-pointer prime, because the next prime (195191947) can be obtained adding 195191897 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190964761 + 4227136 = 13819^2 + 2056^2 .

It is a cyclic number.

It is not a de Polignac number, because 195191897 - 2⁴ = 195191881 is a prime.

It is not a weakly prime, because it can be changed into another prime (195191827) 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, 97595948 + 97595949.

It is an arithmetic number, because the mean of its divisors is an integer number (97595949).

Almost surely, 2^195191897 is an apocalyptic number.

It is an amenable number.

195191897 is a deficient number, since it is larger than the sum of its proper divisors (1).

195191897 is an equidigital number, since it uses as much as digits as its factorization.

195191897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 50.

The square root of 195191897 is about 13971.1093689800. The cubic root of 195191897 is about 580.0791578446.

The spelling of 195191897 in words is "one hundred ninety-five million, one hundred ninety-one thousand, eight hundred ninety-seven".