1279000649 has 2 divisors, whose sum is σ = 1279000650. Its totient is φ = 1279000648.

The previous prime is 1279000621. The next prime is 1279000691. The reversal of 1279000649 is 9460009721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 836655625 + 442345024 = 28925^2 + 21032^2 .

It is a cyclic number.

It is not a de Polignac number, because 1279000649 - 2¹⁶ = 1278935113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1279000249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639500324 + 639500325.

It is an arithmetic number, because the mean of its divisors is an integer number (639500325).

Almost surely, 2^1279000649 is an apocalyptic number.

It is an amenable number.

1279000649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279000649 is an equidigital number, since it uses as much as digits as its factorization.

1279000649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 1279000649 is about 35763.1185580900. The cubic root of 1279000649 is about 1085.4844047392.

The spelling of 1279000649 in words is "one billion, two hundred seventy-nine million, six hundred forty-nine", and thus it is an aban number.