121000009 has 8 divisors (see below), whose sum is σ = 130487112. Its totient is φ = 111538560.

The previous prime is 121000003. The next prime is 121000049. The reversal of 121000009 is 900000121.

It can be written as a sum of positive squares in 4 ways, for example, as 9 + 121000000 = 3^2 + 11000^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121000009 - 2⁹ = 120999497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121000003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4029 + ... + 16069.

It is an arithmetic number, because the mean of its divisors is an integer number (16310889).

Almost surely, 2^121000009 is an apocalyptic number.

It is an amenable number.

121000009 is a deficient number, since it is larger than the sum of its proper divisors (9487103).

121000009 is a wasteful number, since it uses less digits than its factorization.

121000009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12827.

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

The square root of 121000009 is about 11000.0004090909. Note that the first 3 decimals coincide. The cubic root of 121000009 is about 494.6087565879.

The spelling of 121000009 in words is "one hundred twenty-one million, nine", and thus it is an aban number.