195990969 has 4 divisors (see below), whose sum is σ = 261321296. Its totient is φ = 130660644.

The previous prime is 195990941. The next prime is 195990983. The reversal of 195990969 is 969099591.

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 195990969 - 2⁸ = 195990713 is a prime.

It is a super-2 number, since 2×195990969² = 76824919859117922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195990919) 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 in 3 ways as a sum of consecutive naturals, for example, 32665159 + ... + 32665164.

It is an arithmetic number, because the mean of its divisors is an integer number (65330324).

Almost surely, 2^195990969 is an apocalyptic number.

It is an amenable number.

195990969 is a deficient number, since it is larger than the sum of its proper divisors (65330327).

195990969 is an equidigital number, since it uses as much as digits as its factorization.

195990969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65330326.

The product of its (nonzero) digits is 1771470, while the sum is 57.

The square root of 195990969 is about 13999.6774605703. The cubic root of 195990969 is about 580.8696515962.

The spelling of 195990969 in words is "one hundred ninety-five million, nine hundred ninety thousand, nine hundred sixty-nine".