195149173 has 2 divisors, whose sum is σ = 195149174. Its totient is φ = 195149172.

The previous prime is 195149147. The next prime is 195149177. The reversal of 195149173 is 371941591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128187684 + 66961489 = 11322^2 + 8183^2 .

It is a cyclic number.

It is not a de Polignac number, because 195149173 - 2²¹ = 193052021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195149177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97574586 + 97574587.

It is an arithmetic number, because the mean of its divisors is an integer number (97574587).

Almost surely, 2^195149173 is an apocalyptic number.

It is an amenable number.

195149173 is a deficient number, since it is larger than the sum of its proper divisors (1).

195149173 is an equidigital number, since it uses as much as digits as its factorization.

195149173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 40.

The square root of 195149173 is about 13969.5802728643. The cubic root of 195149173 is about 580.0368317871.

The spelling of 195149173 in words is "one hundred ninety-five million, one hundred forty-nine thousand, one hundred seventy-three".