1247416947817 has 2 divisors, whose sum is σ = 1247416947818. Its totient is φ = 1247416947816.

The previous prime is 1247416947779. The next prime is 1247416947859. The reversal of 1247416947817 is 7187496147421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 847865273616 + 399551674201 = 920796^2 + 632101^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247416947817 - 2¹⁹ = 1247416423529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1247416942817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623708473908 + 623708473909.

It is an arithmetic number, because the mean of its divisors is an integer number (623708473909).

Almost surely, 2^{1247416947817} is an apocalyptic number.

It is an amenable number.

1247416947817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247416947817 is an equidigital number, since it uses as much as digits as its factorization.

1247416947817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18966528, while the sum is 61.

The spelling of 1247416947817 in words is "one trillion, two hundred forty-seven billion, four hundred sixteen million, nine hundred forty-seven thousand, eight hundred seventeen".