120100009 has 4 divisors (see below), whose sum is σ = 121289220. Its totient is φ = 118910800.

The previous prime is 120100003. The next prime is 120100027. The reversal of 120100009 is 900001021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900001021 = 31 ⋅29032291.

It can be written as a sum of positive squares in 2 ways, for example, as 81000000 + 39100009 = 9000^2 + 6253^2 .

It is a cyclic number.

It is not a de Polignac number, because 120100009 - 2⁵ = 120099977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120100003) 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, 594454 + ... + 594655.

It is an arithmetic number, because the mean of its divisors is an integer number (30322305).

Almost surely, 2^120100009 is an apocalyptic number.

It is an amenable number.

120100009 is a deficient number, since it is larger than the sum of its proper divisors (1189211).

120100009 is a wasteful number, since it uses less digits than its factorization.

120100009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189210.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 120100009 is about 10959.0149648588. The cubic root of 120100009 is about 493.3794009310.

The spelling of 120100009 in words is "one hundred twenty million, one hundred thousand, nine".