1278025225 has 6 divisors (see below), whose sum is σ = 1584751310. Its totient is φ = 1022420160.

The previous prime is 1278025223. The next prime is 1278025237. The reversal of 1278025225 is 5225208721.

It can be written as a sum of positive squares in 3 ways, for example, as 212459776 + 1065565449 = 14576^2 + 32643^2 .

It is not a de Polignac number, because 1278025225 - 2¹ = 1278025223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1278025223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25560480 + ... + 25560529.

Almost surely, 2^1278025225 is an apocalyptic number.

It is an amenable number.

1278025225 is a deficient number, since it is larger than the sum of its proper divisors (306726085).

1278025225 is an equidigital number, since it uses as much as digits as its factorization.

1278025225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51121019 (or 51121014 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 1278025225 is about 35749.4786675274. The cubic root of 1278025225 is about 1085.2083879861.

The spelling of 1278025225 in words is "one billion, two hundred seventy-eight million, twenty-five thousand, two hundred twenty-five".