121909539 has 8 divisors (see below), whose sum is σ = 163013200. Its totient is φ = 81039456.

The previous prime is 121909531. The next prime is 121909547. The reversal of 121909539 is 935909121.

It is an interprime number because it is at equal distance from previous prime (121909531) and next prime (121909547).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121909539 - 2³ = 121909531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121909497 and 121909506.

It is not an unprimeable number, because it can be changed into a prime (121909531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57172 + ... + 59265.

It is an arithmetic number, because the mean of its divisors is an integer number (20376650).

Almost surely, 2^121909539 is an apocalyptic number.

121909539 is a deficient number, since it is larger than the sum of its proper divisors (41103661).

121909539 is a wasteful number, since it uses less digits than its factorization.

121909539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116789.

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

The square root of 121909539 is about 11041.2652807547. The cubic root of 121909539 is about 495.8449521338.

The spelling of 121909539 in words is "one hundred twenty-one million, nine hundred nine thousand, five hundred thirty-nine".