100120605 has 16 divisors (see below), whose sum is σ = 172515840. Its totient is φ = 49290048.

The previous prime is 100120591. The next prime is 100120613. The reversal of 100120605 is 506021001.

It is not a de Polignac number, because 100120605 - 2¹⁸ = 99858461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256525 + ... + 256914.

It is an arithmetic number, because the mean of its divisors is an integer number (10782240).

Almost surely, 2^100120605 is an apocalyptic number.

100120605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100120605 is a deficient number, since it is larger than the sum of its proper divisors (72395235).

100120605 is a wasteful number, since it uses less digits than its factorization.

100120605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513460.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 100120605 is about 10006.0284328998. The cubic root of 100120605 is about 464.3454080024.

Adding to 100120605 its reverse (506021001), we get a palindrome (606141606).

The spelling of 100120605 in words is "one hundred million, one hundred twenty thousand, six hundred five".