129381269 has 2 divisors, whose sum is σ = 129381270. Its totient is φ = 129381268.

The previous prime is 129381211. The next prime is 129381283. The reversal of 129381269 is 962183921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129095044 + 286225 = 11362^2 + 535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129381269 is a prime.

It is a super-2 number, since 2×129381269² = 33479025536100722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129381289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64690634 + 64690635.

It is an arithmetic number, because the mean of its divisors is an integer number (64690635).

Almost surely, 2^129381269 is an apocalyptic number.

It is an amenable number.

129381269 is a deficient number, since it is larger than the sum of its proper divisors (1).

129381269 is an equidigital number, since it uses as much as digits as its factorization.

129381269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 129381269 is about 11374.5887398182. The cubic root of 129381269 is about 505.7747399909.

The spelling of 129381269 in words is "one hundred twenty-nine million, three hundred eighty-one thousand, two hundred sixty-nine".