1947467217109 has 2 divisors, whose sum is σ = 1947467217110. Its totient is φ = 1947467217108.

The previous prime is 1947467217089. The next prime is 1947467217139. The reversal of 1947467217109 is 9017127647491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1487948634225 + 459518582884 = 1219815^2 + 677878^2 .

It is a cyclic number.

It is not a de Polignac number, because 1947467217109 - 2³⁵ = 1913107478741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1947467217139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 973733608554 + 973733608555.

It is an arithmetic number, because the mean of its divisors is an integer number (973733608555).

Almost surely, 2^{1947467217109} is an apocalyptic number.

It is an amenable number.

1947467217109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1947467217109 is an equidigital number, since it uses as much as digits as its factorization.

1947467217109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5334336, while the sum is 58.

The spelling of 1947467217109 in words is "one trillion, nine hundred forty-seven billion, four hundred sixty-seven million, two hundred seventeen thousand, one hundred nine".