99853921 has 2 divisors, whose sum is σ = 99853922. Its totient is φ = 99853920.

The previous prime is 99853913. The next prime is 99853933. The reversal of 99853921 is 12935899.

It is the 4080-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64320400 + 35533521 = 8020^2 + 5961^2 .

It is an emirp because it is prime and its reverse (12935899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99853921 - 2³ = 99853913 is a prime.

It is not a weakly prime, because it can be changed into another prime (99853951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49926960 + 49926961.

It is an arithmetic number, because the mean of its divisors is an integer number (49926961).

Almost surely, 2^99853921 is an apocalyptic number.

It is an amenable number.

99853921 is a deficient number, since it is larger than the sum of its proper divisors (1).

99853921 is an equidigital number, since it uses as much as digits as its factorization.

99853921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 46.

The square root of 99853921 is about 9992.6933806657. The cubic root of 99853921 is about 463.9327603343.

The spelling of 99853921 in words is "ninety-nine million, eight hundred fifty-three thousand, nine hundred twenty-one".