121859 has 4 divisors (see below), whose sum is σ = 122616. Its totient is φ = 121104.

The previous prime is 121853. The next prime is 121867. The reversal of 121859 is 958121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 121859 - 2⁴ = 121843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29 + ... + 494.

It is an arithmetic number, because the mean of its divisors is an integer number (30654).

2¹²¹⁸⁵⁹ is an apocalyptic number.

121859 is a deficient number, since it is larger than the sum of its proper divisors (757).

121859 is an equidigital number, since it uses as much as digits as its factorization.

121859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756.

The product of its digits is 720, while the sum is 26.

The square root of 121859 is about 349.0830846661. The cubic root of 121859 is about 49.5776423256.

The spelling of 121859 in words is "one hundred twenty-one thousand, eight hundred fifty-nine".