99819857 has 4 divisors (see below), whose sum is σ = 99846000. Its totient is φ = 99793716.

The previous prime is 99819833. The next prime is 99819859. The reversal of 99819857 is 75891899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99819857 - 2¹⁰ = 99818833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99819859) 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 in 3 ways as a sum of consecutive naturals, for example, 6107 + ... + 15392.

It is an arithmetic number, because the mean of its divisors is an integer number (24961500).

Almost surely, 2^99819857 is an apocalyptic number.

It is an amenable number.

99819857 is a deficient number, since it is larger than the sum of its proper divisors (26143).

99819857 is a wasteful number, since it uses less digits than its factorization.

99819857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26142.

The product of its digits is 1632960, while the sum is 56.

The square root of 99819857 is about 9990.9887899046. The cubic root of 99819857 is about 463.8799992517.

The spelling of 99819857 in words is "ninety-nine million, eight hundred nineteen thousand, eight hundred fifty-seven".