29278289 has 2 divisors, whose sum is σ = 29278290. Its totient is φ = 29278288.

The previous prime is 29278279. The next prime is 29278307. The reversal of 29278289 is 98287292.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 10857025 = 4292^2 + 3295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29278289 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (29278279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14639144 + 14639145.

It is an arithmetic number, because the mean of its divisors is an integer number (14639145).

Almost surely, 2^29278289 is an apocalyptic number.

It is an amenable number.

29278289 is a deficient number, since it is larger than the sum of its proper divisors (1).

29278289 is an equidigital number, since it uses as much as digits as its factorization.

29278289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 29278289 is about 5410.9416001284. The cubic root of 29278289 is about 308.2113050757.

The spelling of 29278289 in words is "twenty-nine million, two hundred seventy-eight thousand, two hundred eighty-nine".