1278504871 has 16 divisors (see below), whose sum is σ = 1470424384. Its totient is φ = 1088930304.

The previous prime is 1278504823. The next prime is 1278504901. The reversal of 1278504871 is 1784058721.

It is not a de Polignac number, because 1278504871 - 2¹⁷ = 1278373799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278504371) 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 in 15 ways as a sum of consecutive naturals, for example, 879181 + ... + 880633.

It is an arithmetic number, because the mean of its divisors is an integer number (91901524).

Almost surely, 2^1278504871 is an apocalyptic number.

1278504871 is a deficient number, since it is larger than the sum of its proper divisors (191919513).

1278504871 is a wasteful number, since it uses less digits than its factorization.

1278504871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170.

The product of its (nonzero) digits is 125440, while the sum is 43.

The square root of 1278504871 is about 35756.1864717142. The cubic root of 1278504871 is about 1085.3441314620.

The spelling of 1278504871 in words is "one billion, two hundred seventy-eight million, five hundred four thousand, eight hundred seventy-one".