129278273 has 2 divisors, whose sum is σ = 129278274. Its totient is φ = 129278272.

The previous prime is 129278249. The next prime is 129278297. The reversal of 129278273 is 372872921.

It is a balanced prime because it is at equal distance from previous prime (129278249) and next prime (129278297).

It can be written as a sum of positive squares in only one way, i.e., 122058304 + 7219969 = 11048^2 + 2687^2 .

It is a cyclic number.

It is not a de Polignac number, because 129278273 - 2¹² = 129274177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129278273.

It is not a weakly prime, because it can be changed into another prime (129278213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64639136 + 64639137.

It is an arithmetic number, because the mean of its divisors is an integer number (64639137).

Almost surely, 2^129278273 is an apocalyptic number.

It is an amenable number.

129278273 is a deficient number, since it is larger than the sum of its proper divisors (1).

129278273 is an equidigital number, since it uses as much as digits as its factorization.

129278273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 129278273 is about 11370.0603780279. The cubic root of 129278273 is about 505.6404943753.

The spelling of 129278273 in words is "one hundred twenty-nine million, two hundred seventy-eight thousand, two hundred seventy-three".