121279 has 4 divisors (see below), whose sum is σ = 126576. Its totient is φ = 115984.

The previous prime is 121271. The next prime is 121283. The reversal of 121279 is 972121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121279 - 2³ = 121271 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a pancake number, because a pancake can be divided into 121279 parts by 492 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2614 + ... + 2659.

It is an arithmetic number, because the mean of its divisors is an integer number (31644).

2¹²¹²⁷⁹ is an apocalyptic number.

121279 is a deficient number, since it is larger than the sum of its proper divisors (5297).

121279 is an equidigital number, since it uses as much as digits as its factorization.

121279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5296.

The product of its digits is 252, while the sum is 22.

The square root of 121279 is about 348.2513460132. The cubic root of 121279 is about 49.4988606343.

It can be divided in two parts, 121 and 279, that added together give a square (400 = 20²).

The spelling of 121279 in words is "one hundred twenty-one thousand, two hundred seventy-nine".