129141869 has 2 divisors, whose sum is σ = 129141870. Its totient is φ = 129141868.

The previous prime is 129141827. The next prime is 129141907. The reversal of 129141869 is 968141921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107889769 + 21252100 = 10387^2 + 4610^2 .

It is a cyclic number.

It is not a de Polignac number, because 129141869 - 2¹² = 129137773 is a prime.

It is a super-2 number, since 2×129141869² = 33355244657626322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129141769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64570934 + 64570935.

It is an arithmetic number, because the mean of its divisors is an integer number (64570935).

Almost surely, 2^129141869 is an apocalyptic number.

It is an amenable number.

129141869 is a deficient number, since it is larger than the sum of its proper divisors (1).

129141869 is an equidigital number, since it uses as much as digits as its factorization.

129141869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 129141869 is about 11364.0604099063. The cubic root of 129141869 is about 505.4625947786.

The spelling of 129141869 in words is "one hundred twenty-nine million, one hundred forty-one thousand, eight hundred sixty-nine".