1278440453 has 2 divisors, whose sum is σ = 1278440454. Its totient is φ = 1278440452.

The previous prime is 1278440447. The next prime is 1278440483. The reversal of 1278440453 is 3540448721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1213686244 + 64754209 = 34838^2 + 8047^2 .

It is an emirp because it is prime and its reverse (3540448721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1278440453 - 2⁸ = 1278440197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278440483) 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 as a sum of consecutive naturals, namely, 639220226 + 639220227.

It is an arithmetic number, because the mean of its divisors is an integer number (639220227).

Almost surely, 2^1278440453 is an apocalyptic number.

It is an amenable number.

1278440453 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278440453 is an equidigital number, since it uses as much as digits as its factorization.

1278440453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 1278440453 is about 35755.2856651992. The cubic root of 1278440453 is about 1085.3259026506.

The spelling of 1278440453 in words is "one billion, two hundred seventy-eight million, four hundred forty thousand, four hundred fifty-three".