195811969 has 2 divisors, whose sum is σ = 195811970. Its totient is φ = 195811968.

The previous prime is 195811943. The next prime is 195811991. The reversal of 195811969 is 969118591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104857600 + 90954369 = 10240^2 + 9537^2 .

It is a cyclic number.

It is not a de Polignac number, because 195811969 - 2²¹ = 193714817 is a prime.

It is a super-2 number, since 2×195811969² = 76684654407313922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195811919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97905984 + 97905985.

It is an arithmetic number, because the mean of its divisors is an integer number (97905985).

Almost surely, 2^195811969 is an apocalyptic number.

It is an amenable number.

195811969 is a deficient number, since it is larger than the sum of its proper divisors (1).

195811969 is an equidigital number, since it uses as much as digits as its factorization.

195811969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 49.

The square root of 195811969 is about 13993.2829957805. The cubic root of 195811969 is about 580.6927602184.

The spelling of 195811969 in words is "one hundred ninety-five million, eight hundred eleven thousand, nine hundred sixty-nine".