121365409 has 8 divisors (see below), whose sum is σ = 134075520. Its totient is φ = 108934800.

The previous prime is 121365383. The next prime is 121365427. The reversal of 121365409 is 904563121.

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 121365409 - 2⁹ = 121364897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121365469) 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, 68962 + ... + 70699.

It is an arithmetic number, because the mean of its divisors is an integer number (16759440).

Almost surely, 2^121365409 is an apocalyptic number.

It is an amenable number.

121365409 is a deficient number, since it is larger than the sum of its proper divisors (12710111).

121365409 is a wasteful number, since it uses less digits than its factorization.

121365409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139751.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 121365409 is about 11016.5969791038. The cubic root of 121365409 is about 495.1061351165.

The spelling of 121365409 in words is "one hundred twenty-one million, three hundred sixty-five thousand, four hundred nine".