1278131423 has 2 divisors, whose sum is σ = 1278131424. Its totient is φ = 1278131422.

The previous prime is 1278131401. The next prime is 1278131443. The reversal of 1278131423 is 3241318721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1278131423 - 2²⁴ = 1261354207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1278131423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278131443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639065711 + 639065712.

It is an arithmetic number, because the mean of its divisors is an integer number (639065712).

Almost surely, 2^1278131423 is an apocalyptic number.

1278131423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278131423 is an equidigital number, since it uses as much as digits as its factorization.

1278131423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 1278131423 is about 35750.9639450463. The cubic root of 1278131423 is about 1085.2384457570.

The spelling of 1278131423 in words is "one billion, two hundred seventy-eight million, one hundred thirty-one thousand, four hundred twenty-three".