1276278541 has 2 divisors, whose sum is σ = 1276278542. Its totient is φ = 1276278540.

The previous prime is 1276278527. The next prime is 1276278547. The reversal of 1276278541 is 1458726721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276275625 + 2916 = 35725^2 + 54^2 .

It is a cyclic number.

It is not a de Polignac number, because 1276278541 - 2¹³ = 1276270349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1276278547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638139270 + 638139271.

It is an arithmetic number, because the mean of its divisors is an integer number (638139271).

Almost surely, 2^1276278541 is an apocalyptic number.

It is an amenable number.

1276278541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276278541 is an equidigital number, since it uses as much as digits as its factorization.

1276278541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188160, while the sum is 43.

The square root of 1276278541 is about 35725.0408117332. The cubic root of 1276278541 is about 1084.7137758599.

The spelling of 1276278541 in words is "one billion, two hundred seventy-six million, two hundred seventy-eight thousand, five hundred forty-one".