121242609 has 16 divisors (see below), whose sum is σ = 180087040. Its totient is φ = 80617680.

The previous prime is 121242587. The next prime is 121242631. The reversal of 121242609 is 906242121.

121242609 is a `hidden beast` number, since 1 + 2 + 12 + 42 + 609 = 666.

It is an interprime number because it is at equal distance from previous prime (121242587) and next prime (121242631).

It is not a de Polignac number, because 121242609 - 2⁷ = 121242481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121242409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5064 + ... + 16374.

It is an arithmetic number, because the mean of its divisors is an integer number (11255440).

Almost surely, 2^121242609 is an apocalyptic number.

It is an amenable number.

121242609 is a deficient number, since it is larger than the sum of its proper divisors (58844431).

121242609 is a wasteful number, since it uses less digits than its factorization.

121242609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11717 (or 11711 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 121242609 is about 11011.0221596362. The cubic root of 121242609 is about 494.9390925978.

The spelling of 121242609 in words is "one hundred twenty-one million, two hundred forty-two thousand, six hundred nine".