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1279 is a prime number
BaseRepresentation
bin10011111111
31202101
4103333
520104
65531
73505
oct2377
91671
101279
11a63
128a7
13775
14675
155a4
hex4ff

1279 has 2 divisors, whose sum is σ = 1280. Its totient is φ = 1278.

The previous prime is 1277. The next prime is 1283. The reversal of 1279 is 9721.

It can be divided in two parts, 127 and 9, that added together give a triangular number (136 = T16).

1279 = 122 + 132 + ... + 172.

It is a weak prime.

It is an emirp because it is prime and its reverse (9721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1279 - 21 = 1277 is a prime.

Together with 1277, it forms a pair of twin primes.

It is a plaindrome in base 8, base 10 and base 16.

It is a nialpdrome in base 6, base 11 and base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639 + 640.

It is an arithmetic number, because the mean of its divisors is an integer number (640).

21279 is an apocalyptic number.

1279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279 is an equidigital number, since it uses as much as digits as its factorization.

1279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126, while the sum is 19.

The square root of 1279 is about 35.7631094845. The cubic root of 1279 is about 10.8548422114.

The spelling of 1279 in words is "one thousand, two hundred seventy-nine".