121540559 has 8 divisors (see below), whose sum is σ = 140178720. Its totient is φ = 103221216.

The previous prime is 121540541. The next prime is 121540561. The reversal of 121540559 is 955045121.

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

It is a de Polignac number, because none of the positive numbers 2^k-121540559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121540589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78884 + ... + 80409.

It is an arithmetic number, because the mean of its divisors is an integer number (17522340).

Almost surely, 2^121540559 is an apocalyptic number.

121540559 is a deficient number, since it is larger than the sum of its proper divisors (18638161).

121540559 is a wasteful number, since it uses less digits than its factorization.

121540559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159409.

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 121540559 is about 11024.5434826119. The cubic root of 121540559 is about 495.3441934939.

The spelling of 121540559 in words is "one hundred twenty-one million, five hundred forty thousand, five hundred fifty-nine".