99999491 has 12 divisors (see below), whose sum is σ = 106762320. Its totient is φ = 93644160.

The previous prime is 99999481. The next prime is 99999509. The reversal of 99999491 is 19499999.

It is a de Polignac number, because none of the positive numbers 2^k-99999491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99999491.

It is not an unprimeable number, because it can be changed into a prime (99999401) 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 11 ways as a sum of consecutive naturals, for example, 65426 + ... + 66936.

It is an arithmetic number, because the mean of its divisors is an integer number (8896860).

Almost surely, 2^99999491 is an apocalyptic number.

99999491 is a deficient number, since it is larger than the sum of its proper divisors (6762829).

99999491 is a wasteful number, since it uses less digits than its factorization.

99999491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774 (or 1757 counting only the distinct ones).

The product of its digits is 2125764, while the sum is 59.

The square root of 99999491 is about 9999.9745499676. The cubic root of 99999491 is about 464.1580958370.

The spelling of 99999491 in words is "ninety-nine million, nine hundred ninety-nine thousand, four hundred ninety-one".