195131997 has 20 divisors (see below), whose sum is σ = 298608156. Its totient is φ = 126912960.

The previous prime is 195131983. The next prime is 195132029. The reversal of 195131997 is 799131591.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 98188281 + 96943716 = 9909^2 + 9846^2 .

It is not a de Polignac number, because 195131997 - 2⁷ = 195131869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195132997) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26058 + ... + 32699.

Almost surely, 2^195131997 is an apocalyptic number.

It is an amenable number.

195131997 is a deficient number, since it is larger than the sum of its proper divisors (103476159).

195131997 is an equidigital number, since it uses as much as digits as its factorization.

195131997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58810 (or 58801 counting only the distinct ones).

The product of its digits is 76545, while the sum is 45.

The square root of 195131997 is about 13968.9654949821. The cubic root of 195131997 is about 580.0198140278.

The spelling of 195131997 in words is "one hundred ninety-five million, one hundred thirty-one thousand, nine hundred ninety-seven".