99991158 has 8 divisors (see below), whose sum is σ = 199982328. Its totient is φ = 33330384.

The previous prime is 99991109. The next prime is 99991207. The reversal of 99991158 is 85119999.

It is an interprime number because it is at equal distance from previous prime (99991109) and next prime (99991207).

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

99991158 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 99991158.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 8332591 + ... + 8332602.

It is an arithmetic number, because the mean of its divisors is an integer number (24997791).

Almost surely, 2^99991158 is an apocalyptic number.

99991158 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99991158 is a wasteful number, since it uses less digits than its factorization.

99991158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16665198.

The product of its digits is 262440, while the sum is 51.

The square root of 99991158 is about 9999.5578902269. The cubic root of 99991158 is about 464.1452026486.

The spelling of 99991158 in words is "ninety-nine million, nine hundred ninety-one thousand, one hundred fifty-eight".