1279730849 has 2 divisors, whose sum is σ = 1279730850. Its totient is φ = 1279730848.

The previous prime is 1279730843. The next prime is 1279730891. The reversal of 1279730849 is 9480379721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1101775249 + 177955600 = 33193^2 + 13340^2 .

It is a cyclic number.

It is not a de Polignac number, because 1279730849 - 2¹² = 1279726753 is a prime.

It is a super-2 number, since 2×1279730849² = 3275422091764521602, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1279730797 and 1279730806.

It is not a weakly prime, because it can be changed into another prime (1279730843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639865424 + 639865425.

It is an arithmetic number, because the mean of its divisors is an integer number (639865425).

Almost surely, 2^1279730849 is an apocalyptic number.

It is an amenable number.

1279730849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279730849 is an equidigital number, since it uses as much as digits as its factorization.

1279730849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 1279730849 is about 35773.3259426629. The cubic root of 1279730849 is about 1085.6909383640.

The spelling of 1279730849 in words is "one billion, two hundred seventy-nine million, seven hundred thirty thousand, eight hundred forty-nine".