99855251 has 2 divisors, whose sum is σ = 99855252. Its totient is φ = 99855250.

The previous prime is 99855211. The next prime is 99855253. The reversal of 99855251 is 15255899.

It is a strong prime.

It is an emirp because it is prime and its reverse (15255899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99855251 - 2⁶ = 99855187 is a prime.

It is a Sophie Germain prime.

Together with 99855253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99855253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49927625 + 49927626.

It is an arithmetic number, because the mean of its divisors is an integer number (49927626).

Almost surely, 2^99855251 is an apocalyptic number.

99855251 is a deficient number, since it is larger than the sum of its proper divisors (1).

99855251 is an equidigital number, since it uses as much as digits as its factorization.

99855251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 44.

The square root of 99855251 is about 9992.7599290686. The cubic root of 99855251 is about 463.9348201027.

The spelling of 99855251 in words is "ninety-nine million, eight hundred fifty-five thousand, two hundred fifty-one".