1276844489 has 2 divisors, whose sum is σ = 1276844490. Its totient is φ = 1276844488.

The previous prime is 1276844477. The next prime is 1276844587. The reversal of 1276844489 is 9844486721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1058396089 + 218448400 = 32533^2 + 14780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1276844489 - 2¹⁶ = 1276778953 is a prime.

It is a super-2 number, since 2×1276844489² = 3260663698179342242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1276844489.

It is not a weakly prime, because it can be changed into another prime (1276843489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638422244 + 638422245.

It is an arithmetic number, because the mean of its divisors is an integer number (638422245).

Almost surely, 2^1276844489 is an apocalyptic number.

It is an amenable number.

1276844489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276844489 is an equidigital number, since it uses as much as digits as its factorization.

1276844489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3096576, while the sum is 53.

The square root of 1276844489 is about 35732.9608205086. The cubic root of 1276844489 is about 1084.8740859213.

The spelling of 1276844489 in words is "one billion, two hundred seventy-six million, eight hundred forty-four thousand, four hundred eighty-nine".