99278447 has 2 divisors, whose sum is σ = 99278448. Its totient is φ = 99278446.

The previous prime is 99278407. The next prime is 99278471. The reversal of 99278447 is 74487299.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99278447 - 2⁶ = 99278383 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 99278395 and 99278404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99278407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49639223 + 49639224.

It is an arithmetic number, because the mean of its divisors is an integer number (49639224).

Almost surely, 2^99278447 is an apocalyptic number.

99278447 is a deficient number, since it is larger than the sum of its proper divisors (1).

99278447 is an equidigital number, since it uses as much as digits as its factorization.

99278447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 50.

The square root of 99278447 is about 9963.8570343015. The cubic root of 99278447 is about 463.0398033287.

The spelling of 99278447 in words is "ninety-nine million, two hundred seventy-eight thousand, four hundred forty-seven".