195990697 has 4 divisors (see below), whose sum is σ = 223989376. Its totient is φ = 167992020.

The previous prime is 195990679. The next prime is 195990713. The reversal of 195990697 is 796099591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 195990697 - 2²⁷ = 61772969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195990607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13999329 + ... + 13999342.

It is an arithmetic number, because the mean of its divisors is an integer number (55997344).

Almost surely, 2^195990697 is an apocalyptic number.

It is an amenable number.

195990697 is a deficient number, since it is larger than the sum of its proper divisors (27998679).

195990697 is an equidigital number, since it uses as much as digits as its factorization.

195990697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27998678.

The product of its (nonzero) digits is 1377810, while the sum is 55.

The square root of 195990697 is about 13999.6677460574. The cubic root of 195990697 is about 580.8693828821.

The spelling of 195990697 in words is "one hundred ninety-five million, nine hundred ninety thousand, six hundred ninety-seven".