1276561427 has 2 divisors, whose sum is σ = 1276561428. Its totient is φ = 1276561426.

The previous prime is 1276561367. The next prime is 1276561471. The reversal of 1276561427 is 7241656721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1276561427 - 2⁸ = 1276561171 is a prime.

It is not a weakly prime, because it can be changed into another prime (1276561487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638280713 + 638280714.

It is an arithmetic number, because the mean of its divisors is an integer number (638280714).

Almost surely, 2^1276561427 is an apocalyptic number.

1276561427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276561427 is an equidigital number, since it uses as much as digits as its factorization.

1276561427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The square root of 1276561427 is about 35728.9998040807. Note that the first 3 decimals coincide. The cubic root of 1276561427 is about 1084.7939118864.

The spelling of 1276561427 in words is "one billion, two hundred seventy-six million, five hundred sixty-one thousand, four hundred twenty-seven".