195729869 has 2 divisors, whose sum is σ = 195729870. Its totient is φ = 195729868.

The previous prime is 195729841. The next prime is 195729871. The reversal of 195729869 is 968927591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188101225 + 7628644 = 13715^2 + 2762^2 .

It is a cyclic number.

It is not a de Polignac number, because 195729869 - 2¹⁶ = 195664333 is a prime.

It is a super-2 number, since 2×195729869² = 76620363237514322, which contains 22 as substring.

Together with 195729871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195729829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97864934 + 97864935.

It is an arithmetic number, because the mean of its divisors is an integer number (97864935).

Almost surely, 2^195729869 is an apocalyptic number.

It is an amenable number.

195729869 is a deficient number, since it is larger than the sum of its proper divisors (1).

195729869 is an equidigital number, since it uses as much as digits as its factorization.

195729869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 56.

The square root of 195729869 is about 13990.3491378879. The cubic root of 195729869 is about 580.6115912949.

The spelling of 195729869 in words is "one hundred ninety-five million, seven hundred twenty-nine thousand, eight hundred sixty-nine".