195521969 has 2 divisors, whose sum is σ = 195521970. Its totient is φ = 195521968.

The previous prime is 195521941. The next prime is 195521983. The reversal of 195521969 is 969125591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155326369 + 40195600 = 12463^2 + 6340^2 .

It is a cyclic number.

It is not a de Polignac number, because 195521969 - 2⁸ = 195521713 is a prime.

It is a super-2 number, since 2×195521969² = 76457680723273922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195521869) 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, 97760984 + 97760985.

It is an arithmetic number, because the mean of its divisors is an integer number (97760985).

Almost surely, 2^195521969 is an apocalyptic number.

It is an amenable number.

195521969 is a deficient number, since it is larger than the sum of its proper divisors (1).

195521969 is an equidigital number, since it uses as much as digits as its factorization.

195521969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 218700, while the sum is 47.

The square root of 195521969 is about 13982.9170418765. The cubic root of 195521969 is about 580.4059474759.

The spelling of 195521969 in words is "one hundred ninety-five million, five hundred twenty-one thousand, nine hundred sixty-nine".