129198869 has 2 divisors, whose sum is σ = 129198870. Its totient is φ = 129198868.

The previous prime is 129198863. The next prime is 129198871. The reversal of 129198869 is 968891921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114276100 + 14922769 = 10690^2 + 3863^2 .

It is a cyclic number.

It is not a de Polignac number, because 129198869 - 2¹² = 129194773 is a prime.

It is a super-2 number, since 2×129198869² = 33384695501758322, which contains 22 as substring.

Together with 129198871, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129198869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129198863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64599434 + 64599435.

It is an arithmetic number, because the mean of its divisors is an integer number (64599435).

Almost surely, 2^129198869 is an apocalyptic number.

It is an amenable number.

129198869 is a deficient number, since it is larger than the sum of its proper divisors (1).

129198869 is an equidigital number, since it uses as much as digits as its factorization.

129198869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 53.

The square root of 129198869 is about 11366.5680396503. The cubic root of 129198869 is about 505.5369500342.

The spelling of 129198869 in words is "one hundred twenty-nine million, one hundred ninety-eight thousand, eight hundred sixty-nine".