99999641 has 24 divisors (see below), whose sum is σ = 125801280. Its totient is φ = 78980832.

The previous prime is 99999623. The next prime is 99999643. The reversal of 99999641 is 14699999.

It is a de Polignac number, because none of the positive numbers 2^k-99999641 is a prime.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99999643) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 32996 + ... + 35898.

It is an arithmetic number, because the mean of its divisors is an integer number (5241720).

Almost surely, 2^99999641 is an apocalyptic number.

It is an amenable number.

99999641 is a deficient number, since it is larger than the sum of its proper divisors (25801639).

99999641 is a wasteful number, since it uses less digits than its factorization.

99999641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2973 (or 2966 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 56.

The square root of 99999641 is about 9999.9820499839. The cubic root of 99999641 is about 464.1583279171.

The spelling of 99999641 in words is "ninety-nine million, nine hundred ninety-nine thousand, six hundred forty-one".