1247208673 has 2 divisors, whose sum is σ = 1247208674. Its totient is φ = 1247208672.

The previous prime is 1247208661. The next prime is 1247208719. The reversal of 1247208673 is 3768027421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1247007969 + 200704 = 35313^2 + 448^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247208673 - 2²¹ = 1245111521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1247200673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623604336 + 623604337.

It is an arithmetic number, because the mean of its divisors is an integer number (623604337).

Almost surely, 2^1247208673 is an apocalyptic number.

It is an amenable number.

1247208673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247208673 is an equidigital number, since it uses as much as digits as its factorization.

1247208673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 1247208673 is about 35315.8416719749. The cubic root of 1247208673 is about 1076.4149165325.

The spelling of 1247208673 in words is "one billion, two hundred forty-seven million, two hundred eight thousand, six hundred seventy-three".