1279688100289 has 9 divisors (see below), whose sum is σ = 1282823613057. Its totient is φ = 1276560241044.

The previous prime is 1279688100287. The next prime is 1279688100337. The reversal of 1279688100289 is 9820018869721.

The square root of 1279688100289 is 1131233.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1279688100289 - 2¹ = 1279688100287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279688100287) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 564484134 + ... + 564486400.

Almost surely, 2^{1279688100289} is an apocalyptic number.

1279688100289 is the 1131233-rd square number.

1279688100289 is the 565617-th centered octagonal number.

It is an amenable number.

1279688100289 is a deficient number, since it is larger than the sum of its proper divisors (3135512768).

1279688100289 is an frugal number, since it uses more digits than its factorization.

1279688100289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5532 (or 2766 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 61.

The spelling of 1279688100289 in words is "one trillion, two hundred seventy-nine billion, six hundred eighty-eight million, one hundred thousand, two hundred eighty-nine".