98991023 has 4 divisors (see below), whose sum is σ = 99021648. Its totient is φ = 98960400.

The previous prime is 98990999. The next prime is 98991037. The reversal of 98991023 is 32019989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32019989 = 83 ⋅385783.

It is a cyclic number.

It is not a de Polignac number, because 98991023 - 2⁸ = 98990767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98991043) 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 3 ways as a sum of consecutive naturals, for example, 9803 + ... + 17148.

It is an arithmetic number, because the mean of its divisors is an integer number (24755412).

Almost surely, 2^98991023 is an apocalyptic number.

98991023 is a deficient number, since it is larger than the sum of its proper divisors (30625).

98991023 is a wasteful number, since it uses less digits than its factorization.

98991023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30624.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 98991023 is about 9949.4232496160. The cubic root of 98991023 is about 462.5925179416.

The spelling of 98991023 in words is "ninety-eight million, nine hundred ninety-one thousand, twenty-three".