1278246973 has 2 divisors, whose sum is σ = 1278246974. Its totient is φ = 1278246972.

The previous prime is 1278246953. The next prime is 1278246979. The reversal of 1278246973 is 3796428721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1222341444 + 55905529 = 34962^2 + 7477^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278246973 - 2⁵ = 1278246941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278246979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639123486 + 639123487.

It is an arithmetic number, because the mean of its divisors is an integer number (639123487).

Almost surely, 2^1278246973 is an apocalyptic number.

It is an amenable number.

1278246973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278246973 is an equidigital number, since it uses as much as digits as its factorization.

1278246973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The square root of 1278246973 is about 35752.5799488652. The cubic root of 1278246973 is about 1085.2711485817.

The spelling of 1278246973 in words is "one billion, two hundred seventy-eight million, two hundred forty-six thousand, nine hundred seventy-three".