121439859 has 4 divisors (see below), whose sum is σ = 161919816. Its totient is φ = 80959904.

The previous prime is 121439821. The next prime is 121439881. The reversal of 121439859 is 958934121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 958934121 = 3 ⋅319644707.

It is a cyclic number.

It is not a de Polignac number, because 121439859 - 2⁸ = 121439603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121439859.

It is not an unprimeable number, because it can be changed into a prime (121449859) 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, 20239974 + ... + 20239979.

It is an arithmetic number, because the mean of its divisors is an integer number (40479954).

Almost surely, 2^121439859 is an apocalyptic number.

121439859 is a deficient number, since it is larger than the sum of its proper divisors (40479957).

121439859 is an equidigital number, since it uses as much as digits as its factorization.

121439859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40479956.

The product of its digits is 77760, while the sum is 42.

The square root of 121439859 is about 11019.9754536932. The cubic root of 121439859 is about 495.2073531857.

The spelling of 121439859 in words is "one hundred twenty-one million, four hundred thirty-nine thousand, eight hundred fifty-nine".