1279278289 has 9 divisors (see below), whose sum is σ = 1308795931. Its totient is φ = 1250414320.

The previous prime is 1279278281. The next prime is 1279278313. The reversal of 1279278289 is 9828729721.

The square root of 1279278289 is 35767.

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

It can be written as a sum of positive squares in only one way, i.e., 3359889 + 1275918400 = 1833^2 + 35720^2 .

It is not a de Polignac number, because 1279278289 - 2³ = 1279278281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279278281) 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, 1680669 + ... + 1681429.

Almost surely, 2^1279278289 is an apocalyptic number.

1279278289 is the 35767-th square number.

1279278289 is the 17884-th centered octagonal number.

It is an amenable number.

1279278289 is a deficient number, since it is larger than the sum of its proper divisors (29517642).

1279278289 is an frugal number, since it uses more digits than its factorization.

1279278289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616 (or 808 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 55.

The cubic root of 1279278289 is about 1085.5629431632.

The spelling of 1279278289 in words is "one billion, two hundred seventy-nine million, two hundred seventy-eight thousand, two hundred eighty-nine".