99865279 has 2 divisors, whose sum is σ = 99865280. Its totient is φ = 99865278.

The previous prime is 99865267. The next prime is 99865301. The reversal of 99865279 is 97256899.

It is a weak prime.

It is an emirp because it is prime and its reverse (97256899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99865279 - 2¹⁵ = 99832511 is a prime.

It is a super-3 number, since 3×99865279³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99865079) 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, 49932639 + 49932640.

It is an arithmetic number, because the mean of its divisors is an integer number (49932640).

Almost surely, 2^99865279 is an apocalyptic number.

99865279 is a deficient number, since it is larger than the sum of its proper divisors (1).

99865279 is an equidigital number, since it uses as much as digits as its factorization.

99865279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 55.

The square root of 99865279 is about 9993.2616797520. The cubic root of 99865279 is about 463.9503498573.

The spelling of 99865279 in words is "ninety-nine million, eight hundred sixty-five thousand, two hundred seventy-nine".