1278974573 has 2 divisors, whose sum is σ = 1278974574. Its totient is φ = 1278974572.

The previous prime is 1278974561. The next prime is 1278974621. The reversal of 1278974573 is 3754798721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1060023364 + 218951209 = 32558^2 + 14797^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278974573 - 2¹² = 1278970477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278974503) 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 as a sum of consecutive naturals, namely, 639487286 + 639487287.

It is an arithmetic number, because the mean of its divisors is an integer number (639487287).

Almost surely, 2^1278974573 is an apocalyptic number.

It is an amenable number.

1278974573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278974573 is an equidigital number, since it uses as much as digits as its factorization.

1278974573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2963520, while the sum is 53.

The square root of 1278974573 is about 35762.7539907094. The cubic root of 1278974573 is about 1085.4770278121.

The spelling of 1278974573 in words is "one billion, two hundred seventy-eight million, nine hundred seventy-four thousand, five hundred seventy-three".