100079999 has 4 divisors (see below), whose sum is σ = 100184040. Its totient is φ = 99975960.

The previous prime is 100079983. The next prime is 100080031. The reversal of 100079999 is 999970001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999970001 = 599 ⋅1669399.

It is a cyclic number.

It is not a de Polignac number, because 100079999 - 2⁴ = 100079983 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 (100079909) 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, 50564 + ... + 52505.

It is an arithmetic number, because the mean of its divisors is an integer number (25046010).

Almost surely, 2^100079999 is an apocalyptic number.

100079999 is a deficient number, since it is larger than the sum of its proper divisors (104041).

100079999 is an equidigital number, since it uses as much as digits as its factorization.

100079999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104040.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 100079999 is about 10003.9991503398. Note that the first 3 decimals coincide. The cubic root of 100079999 is about 464.2826245249.

The spelling of 100079999 in words is "one hundred million, seventy-nine thousand, nine hundred ninety-nine".