1279728259 has 2 divisors, whose sum is σ = 1279728260. Its totient is φ = 1279728258.

The previous prime is 1279728199. The next prime is 1279728271. The reversal of 1279728259 is 9528279721.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1279728259 is a prime.

It is not a weakly prime, because it can be changed into another prime (1279728059) 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 as a sum of consecutive naturals, namely, 639864129 + 639864130.

It is an arithmetic number, because the mean of its divisors is an integer number (639864130).

Almost surely, 2^1279728259 is an apocalyptic number.

1279728259 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279728259 is an equidigital number, since it uses as much as digits as its factorization.

1279728259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 52.

The square root of 1279728259 is about 35773.2897424880. The cubic root of 1279728259 is about 1085.6902059336.

The spelling of 1279728259 in words is "one billion, two hundred seventy-nine million, seven hundred twenty-eight thousand, two hundred fifty-nine".