129672779 has 2 divisors, whose sum is σ = 129672780. Its totient is φ = 129672778.

The previous prime is 129672769. The next prime is 129672797. The reversal of 129672779 is 977276921.

Together with next prime (129672797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (977276921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129672779 - 2⁸ = 129672523 is a prime.

It is a super-2 number, since 2×129672779² = 33630059227165682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129672749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64836389 + 64836390.

It is an arithmetic number, because the mean of its divisors is an integer number (64836390).

Almost surely, 2^129672779 is an apocalyptic number.

129672779 is a deficient number, since it is larger than the sum of its proper divisors (1).

129672779 is an equidigital number, since it uses as much as digits as its factorization.

129672779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 666792, while the sum is 50.

The square root of 129672779 is about 11387.3956197192. The cubic root of 129672779 is about 506.1543101365.

The spelling of 129672779 in words is "one hundred twenty-nine million, six hundred seventy-two thousand, seven hundred seventy-nine".