99997851 has 8 divisors (see below), whose sum is σ = 134290240. Its totient is φ = 66185352.

The previous prime is 99997841. The next prime is 99997867. The reversal of 99997851 is 15879999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99997851 - 2¹⁴ = 99981467 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99997791 and 99997800.

It is not an unprimeable number, because it can be changed into a prime (99997841) by changing a digit.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119485 + ... + 120318.

It is an arithmetic number, because the mean of its divisors is an integer number (16786280).

Almost surely, 2^99997851 is an apocalyptic number.

99997851 is a deficient number, since it is larger than the sum of its proper divisors (34292389).

99997851 is a wasteful number, since it uses less digits than its factorization.

99997851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239945.

The product of its digits is 1837080, while the sum is 57.

The square root of 99997851 is about 9999.8925494227. The cubic root of 99997851 is about 464.1555584127.

The spelling of 99997851 in words is "ninety-nine million, nine hundred ninety-seven thousand, eight hundred fifty-one".