77798249 has 2 divisors, whose sum is σ = 77798250. Its totient is φ = 77798248.

The previous prime is 77798219. The next prime is 77798291. The reversal of 77798249 is 94289777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77352025 + 446224 = 8795^2 + 668^2 .

It is an emirp because it is prime and its reverse (94289777) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77798249 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77798249.

It is not a weakly prime, because it can be changed into another prime (77798209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38899124 + 38899125.

It is an arithmetic number, because the mean of its divisors is an integer number (38899125).

Almost surely, 2^77798249 is an apocalyptic number.

It is an amenable number.

77798249 is a deficient number, since it is larger than the sum of its proper divisors (1).

77798249 is an equidigital number, since it uses as much as digits as its factorization.

77798249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 53.

The square root of 77798249 is about 8820.3315697314. The cubic root of 77798249 is about 426.8971684069.

The spelling of 77798249 in words is "seventy-seven million, seven hundred ninety-eight thousand, two hundred forty-nine".