1278047425 has 6 divisors (see below), whose sum is σ = 1584778838. Its totient is φ = 1022437920.

The previous prime is 1278047413. The next prime is 1278047431. The reversal of 1278047425 is 5247408721.

It can be written as a sum of positive squares in 3 ways, for example, as 193794241 + 1084253184 = 13921^2 + 32928^2 .

It is not a de Polignac number, because 1278047425 - 2¹⁵ = 1278014657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25560924 + ... + 25560973.

Almost surely, 2^1278047425 is an apocalyptic number.

It is an amenable number.

1278047425 is a deficient number, since it is larger than the sum of its proper divisors (306731413).

1278047425 is an equidigital number, since it uses as much as digits as its factorization.

1278047425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51121907 (or 51121902 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 40.

The square root of 1278047425 is about 35749.7891602174. The cubic root of 1278047425 is about 1085.2146715049.

The spelling of 1278047425 in words is "one billion, two hundred seventy-eight million, forty-seven thousand, four hundred twenty-five".