1278682776131 has 2 divisors, whose sum is σ = 1278682776132. Its totient is φ = 1278682776130.

The previous prime is 1278682776127. The next prime is 1278682776191. The reversal of 1278682776131 is 1316772868721.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1316772868721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1278682776131 - 2² = 1278682776127 is a prime.

It is a super-2 number, since 2×1278682776131² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1278682776191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639341388065 + 639341388066.

It is an arithmetic number, because the mean of its divisors is an integer number (639341388066).

Almost surely, 2^{1278682776131} is an apocalyptic number.

1278682776131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278682776131 is an equidigital number, since it uses as much as digits as its factorization.

1278682776131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9483264, while the sum is 59.

The spelling of 1278682776131 in words is "one trillion, two hundred seventy-eight billion, six hundred eighty-two million, seven hundred seventy-six thousand, one hundred thirty-one".