195172969 has 4 divisors (see below), whose sum is σ = 195427540. Its totient is φ = 194918400.

The previous prime is 195172961. The next prime is 195172973. The reversal of 195172969 is 969271591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 969271591 = 107 ⋅9058613.

It can be written as a sum of positive squares in 2 ways, for example, as 98406400 + 96766569 = 9920^2 + 9837^2 .

It is a cyclic number.

It is not a de Polignac number, because 195172969 - 2³ = 195172961 is a prime.

It is a super-2 number, since 2×195172969² = 76184975656549922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195172961) 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 in 3 ways as a sum of consecutive naturals, for example, 126132 + ... + 127669.

It is an arithmetic number, because the mean of its divisors is an integer number (48856885).

Almost surely, 2^195172969 is an apocalyptic number.

It is an amenable number.

195172969 is a deficient number, since it is larger than the sum of its proper divisors (254571).

195172969 is an equidigital number, since it uses as much as digits as its factorization.

195172969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254570.

The product of its digits is 306180, while the sum is 49.

The square root of 195172969 is about 13970.4319546677. The cubic root of 195172969 is about 580.0604069070.

The spelling of 195172969 in words is "one hundred ninety-five million, one hundred seventy-two thousand, nine hundred sixty-nine".