121659 has 8 divisors (see below), whose sum is σ = 164160. Its totient is φ = 80136.

The previous prime is 121637. The next prime is 121661. The reversal of 121659 is 956121.

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

It is not a de Polignac number, because 121659 - 2⁷ = 121531 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121609) 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, 132 + ... + 510.

It is an arithmetic number, because the mean of its divisors is an integer number (20520).

2¹²¹⁶⁵⁹ is an apocalyptic number.

121659 is a deficient number, since it is larger than the sum of its proper divisors (42501).

121659 is a wasteful number, since it uses less digits than its factorization.

121659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its digits is 540, while the sum is 24.

The square root of 121659 is about 348.7965022760. The cubic root of 121659 is about 49.5505045188.

It can be divided in two parts, 1216 and 59, that added together give a triangular number (1275 = T₅₀).

The spelling of 121659 in words is "one hundred twenty-one thousand, six hundred fifty-nine".