129195789769 has 4 divisors (see below), whose sum is σ = 129196712340. Its totient is φ = 129194867200.

The previous prime is 129195789761. The next prime is 129195789841. The reversal of 129195789769 is 967987591921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 93078687744 + 36117102025 = 305088^2 + 190045^2 .

It is a cyclic number.

It is not a de Polignac number, because 129195789769 - 2³ = 129195789761 is a prime.

It is a super-2 number, since 2×129195789769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129195789761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203032 + ... + 547369.

It is an arithmetic number, because the mean of its divisors is an integer number (32299178085).

Almost surely, 2^129195789769 is an apocalyptic number.

It is an amenable number.

129195789769 is a deficient number, since it is larger than the sum of its proper divisors (922571).

129195789769 is an equidigital number, since it uses as much as digits as its factorization.

129195789769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922570.

The product of its digits is 154314720, while the sum is 73.

The spelling of 129195789769 in words is "one hundred twenty-nine billion, one hundred ninety-five million, seven hundred eighty-nine thousand, seven hundred sixty-nine".