1279627899217 has 16 divisors (see below), whose sum is σ = 1331442121680. Its totient is φ = 1228334284800.

The previous prime is 1279627899203. The next prime is 1279627899227. The reversal of 1279627899217 is 7129987269721.

It can be written as a sum of positive squares in 8 ways, for example, as 153331763776 + 1126296135441 = 391576^2 + 1061271^2 .

It is a cyclic number.

It is not a de Polignac number, because 1279627899217 - 2¹⁵ = 1279627866449 is a prime.

It is a super-3 number, since 3×1279627899217³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

Its product of digits (96018048) is a multiple of the sum of its prime divisors (142884).

It is not an unprimeable number, because it can be changed into a prime (1279627899227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9002217 + ... + 9143257.

It is an arithmetic number, because the mean of its divisors is an integer number (83215132605).

Almost surely, 2^{1279627899217} is an apocalyptic number.

It is an amenable number.

1279627899217 is a deficient number, since it is larger than the sum of its proper divisors (51814222463).

1279627899217 is a wasteful number, since it uses less digits than its factorization.

1279627899217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142884.

The product of its digits is 96018048, while the sum is 70.

The spelling of 1279627899217 in words is "one trillion, two hundred seventy-nine billion, six hundred twenty-seven million, eight hundred ninety-nine thousand, two hundred seventeen".