279641 has 2 divisors, whose sum is σ = 279642. Its totient is φ = 279640.

The previous prime is 279637. The next prime is 279649. The reversal of 279641 is 146972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177241 + 102400 = 421^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 279641 - 2² = 279637 is a prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (279649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139820 + 139821.

It is an arithmetic number, because the mean of its divisors is an integer number (139821).

279641 is a Friedman number, since it can be written as 6^7-291-4, using all its digits and the basic arithmetic operations.

2²⁷⁹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

279641 is a deficient number, since it is larger than the sum of its proper divisors (1).

279641 is an equidigital number, since it uses as much as digits as its factorization.

279641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 279641 is about 528.8109302955. The cubic root of 279641 is about 65.3933544171.

The spelling of 279641 in words is "two hundred seventy-nine thousand, six hundred forty-one".