1277142679 has 2 divisors, whose sum is σ = 1277142680. Its totient is φ = 1277142678.

The previous prime is 1277142649. The next prime is 1277142707. The reversal of 1277142679 is 9762417721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1277142679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1277142649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638571339 + 638571340.

It is an arithmetic number, because the mean of its divisors is an integer number (638571340).

Almost surely, 2^1277142679 is an apocalyptic number.

1277142679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277142679 is an equidigital number, since it uses as much as digits as its factorization.

1277142679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 296352, while the sum is 46.

The square root of 1277142679 is about 35737.1330551291. The cubic root of 1277142679 is about 1084.9585319722.

The spelling of 1277142679 in words is "one billion, two hundred seventy-seven million, one hundred forty-two thousand, six hundred seventy-nine".