100079991 has 24 divisors (see below), whose sum is σ = 159279120. Its totient is φ = 60048000.

The previous prime is 100079983. The next prime is 100080031. The reversal of 100079991 is 199970001.

It is not a de Polignac number, because 100079991 - 2³ = 100079983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100079911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4995 + ... + 15003.

It is an arithmetic number, because the mean of its divisors is an integer number (6636630).

Almost surely, 2^100079991 is an apocalyptic number.

100079991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

100079991 is a deficient number, since it is larger than the sum of its proper divisors (59199129).

100079991 is a wasteful number, since it uses less digits than its factorization.

100079991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10127 (or 10124 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 100079991 is about 10003.9987504997. The cubic root of 100079991 is about 464.2826121540.

The spelling of 100079991 in words is "one hundred million, seventy-nine thousand, nine hundred ninety-one".