98643991 has 16 divisors (see below), whose sum is σ = 107251200. Its totient is φ = 90417600.

The previous prime is 98643989. The next prime is 98643997. The reversal of 98643991 is 19934689.

It is a cyclic number.

It is not a de Polignac number, because 98643991 - 2¹ = 98643989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98643997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107826 + ... + 108736.

It is an arithmetic number, because the mean of its divisors is an integer number (6703200).

Almost surely, 2^98643991 is an apocalyptic number.

98643991 is a deficient number, since it is larger than the sum of its proper divisors (8607209).

98643991 is a wasteful number, since it uses less digits than its factorization.

98643991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110.

The product of its digits is 419904, while the sum is 49.

The square root of 98643991 is about 9931.9681332554. The cubic root of 98643991 is about 462.0513161142.

The spelling of 98643991 in words is "ninety-eight million, six hundred forty-three thousand, nine hundred ninety-one".