121009 has 8 divisors (see below), whose sum is σ = 141120. Its totient is φ = 101616.

The previous prime is 121007. The next prime is 121013. The reversal of 121009 is 900121.

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 121009 - 2¹ = 121007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121009.

It is not an unprimeable number, because it can be changed into a prime (121001) 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, 267 + ... + 559.

It is an arithmetic number, because the mean of its divisors is an integer number (17640).

2¹²¹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

121009 is a deficient number, since it is larger than the sum of its proper divisors (20111).

121009 is an equidigital number, since it uses as much as digits as its factorization.

121009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359.

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

The square root of 121009 is about 347.8634789684. The cubic root of 121009 is about 49.4621007048.

It can be divided in two parts, 12100 and 9, that multiplied together give a square (108900 = 330²).

The spelling of 121009 in words is "one hundred twenty-one thousand, nine".