121539909 has 8 divisors (see below), whose sum is σ = 163568160. Its totient is φ = 80269136.

The previous prime is 121539907. The next prime is 121539911. The reversal of 121539909 is 909935121.

It is an interprime number because it is at equal distance from previous prime (121539907) and next prime (121539911).

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 121539909 - 2¹ = 121539907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121539907) 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, 188994 + ... + 189635.

It is an arithmetic number, because the mean of its divisors is an integer number (20446020).

Almost surely, 2^121539909 is an apocalyptic number.

It is an amenable number.

121539909 is a deficient number, since it is larger than the sum of its proper divisors (42028251).

121539909 is a wasteful number, since it uses less digits than its factorization.

121539909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378739.

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 121539909 is about 11024.5140028937. The cubic root of 121539909 is about 495.3433104572.

The spelling of 121539909 in words is "one hundred twenty-one million, five hundred thirty-nine thousand, nine hundred nine".