121559909 has 8 divisors (see below), whose sum is σ = 127630560. Its totient is φ = 115614576.

The previous prime is 121559887. The next prime is 121559917. The reversal of 121559909 is 909955121.

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 121559909 - 2⁸ = 121559653 is a prime.

It is a super-2 number, since 2×121559909² = 29553622952176562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121559939) 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, 29339 + ... + 33224.

It is an arithmetic number, because the mean of its divisors is an integer number (15953820).

Almost surely, 2^121559909 is an apocalyptic number.

It is an amenable number.

121559909 is a deficient number, since it is larger than the sum of its proper divisors (6070651).

121559909 is an equidigital number, since it uses as much as digits as its factorization.

121559909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62659.

The product of its (nonzero) digits is 36450, while the sum is 41.

The square root of 121559909 is about 11025.4210350444. The cubic root of 121559909 is about 495.3704793736.

The spelling of 121559909 in words is "one hundred twenty-one million, five hundred fifty-nine thousand, nine hundred nine".