129140827 has 2 divisors, whose sum is σ = 129140828. Its totient is φ = 129140826.

The previous prime is 129140813. The next prime is 129140831. The reversal of 129140827 is 728041921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129140827 - 2¹⁹ = 128616539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129140792 and 129140801.

It is not a weakly prime, because it can be changed into another prime (129140887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64570413 + 64570414.

It is an arithmetic number, because the mean of its divisors is an integer number (64570414).

Almost surely, 2^129140827 is an apocalyptic number.

129140827 is a deficient number, since it is larger than the sum of its proper divisors (1).

129140827 is an equidigital number, since it uses as much as digits as its factorization.

129140827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 129140827 is about 11364.0145635246. The cubic root of 129140827 is about 505.4612353087.

The spelling of 129140827 in words is "one hundred twenty-nine million, one hundred forty thousand, eight hundred twenty-seven".