98638791 has 4 divisors (see below), whose sum is σ = 131518392. Its totient is φ = 65759192.

The previous prime is 98638783. The next prime is 98638817. The reversal of 98638791 is 19783689.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 98638791 - 2³ = 98638783 is a prime.

It is a super-2 number, since 2×98638791² = 19459222179883362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98638711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16439796 + ... + 16439801.

It is an arithmetic number, because the mean of its divisors is an integer number (32879598).

Almost surely, 2^98638791 is an apocalyptic number.

98638791 is a deficient number, since it is larger than the sum of its proper divisors (32879601).

98638791 is a wasteful number, since it uses less digits than its factorization.

98638791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32879600.

The product of its digits is 653184, while the sum is 51.

The square root of 98638791 is about 9931.7063488607. The cubic root of 98638791 is about 462.0431969879.

The spelling of 98638791 in words is "ninety-eight million, six hundred thirty-eight thousand, seven hundred ninety-one".