279553 has 2 divisors, whose sum is σ = 279554. Its totient is φ = 279552.

The previous prime is 279551. The next prime is 279557. The reversal of 279553 is 355972.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263169 + 16384 = 513^2 + 128^2 .

It is a cyclic number.

It is not a de Polignac number, because 279553 - 2¹ = 279551 is a prime.

Together with 279551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (279551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139776 + 139777.

It is an arithmetic number, because the mean of its divisors is an integer number (139777).

It is a Proth number, since it is equal to 273 ⋅ 2¹⁰ + 1 and 273 < 2¹⁰.

2²⁷⁹⁵⁵³ is an apocalyptic number.

It is an amenable number.

279553 is a deficient number, since it is larger than the sum of its proper divisors (1).

279553 is an equidigital number, since it uses as much as digits as its factorization.

279553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9450, while the sum is 31.

The square root of 279553 is about 528.7277182066. The cubic root of 279553 is about 65.3864941701.

The spelling of 279553 in words is "two hundred seventy-nine thousand, five hundred fifty-three".