1278448201 has 4 divisors (see below), whose sum is σ = 1278588100. Its totient is φ = 1278308304.

The previous prime is 1278448189. The next prime is 1278448289. The reversal of 1278448201 is 1028448721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1088670025 + 189778176 = 32995^2 + 13776^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278448201 - 2¹⁵ = 1278415433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278448291) 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 3 ways as a sum of consecutive naturals, for example, 55206 + ... + 74863.

It is an arithmetic number, because the mean of its divisors is an integer number (319647025).

Almost surely, 2^1278448201 is an apocalyptic number.

It is an amenable number.

1278448201 is a deficient number, since it is larger than the sum of its proper divisors (139899).

1278448201 is an equidigital number, since it uses as much as digits as its factorization.

1278448201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139898.

The product of its (nonzero) digits is 28672, while the sum is 37.

The square root of 1278448201 is about 35755.3940126521. The cubic root of 1278448201 is about 1085.3280951887.

The spelling of 1278448201 in words is "one billion, two hundred seventy-eight million, four hundred forty-eight thousand, two hundred one".