279121 has 2 divisors, whose sum is σ = 279122. Its totient is φ = 279120.

The previous prime is 279119. The next prime is 279127. The reversal of 279121 is 121972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239121 + 40000 = 489^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 279121 - 2¹ = 279119 is a prime.

Together with 279119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 279092 and 279101.

It is not a weakly prime, because it can be changed into another prime (279127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139560 + 139561.

It is an arithmetic number, because the mean of its divisors is an integer number (139561).

2²⁷⁹¹²¹ is an apocalyptic number.

It is an amenable number.

279121 is a deficient number, since it is larger than the sum of its proper divisors (1).

279121 is an equidigital number, since it uses as much as digits as its factorization.

279121 is an evil number, because the sum of its binary digits is even.

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

The square root of 279121 is about 528.3190324037. The cubic root of 279121 is about 65.3527956965.

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

The spelling of 279121 in words is "two hundred seventy-nine thousand, one hundred twenty-one".