1276540777 has 2 divisors, whose sum is σ = 1276540778. Its totient is φ = 1276540776.

The previous prime is 1276540753. The next prime is 1276540799. The reversal of 1276540777 is 7770456721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1249198336 + 27342441 = 35344^2 + 5229^2 .

It is an emirp because it is prime and its reverse (7770456721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1276540777 - 2¹¹ = 1276538729 is a prime.

It is not a weakly prime, because it can be changed into another prime (1276580777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638270388 + 638270389.

It is an arithmetic number, because the mean of its divisors is an integer number (638270389).

Almost surely, 2^1276540777 is an apocalyptic number.

It is an amenable number.

1276540777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276540777 is an equidigital number, since it uses as much as digits as its factorization.

1276540777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576240, while the sum is 46.

The square root of 1276540777 is about 35728.7108219706. The cubic root of 1276540777 is about 1084.7880625491.

The spelling of 1276540777 in words is "one billion, two hundred seventy-six million, five hundred forty thousand, seven hundred seventy-seven".