1947431861411 has 2 divisors, whose sum is σ = 1947431861412. Its totient is φ = 1947431861410.

The previous prime is 1947431861393. The next prime is 1947431861449. The reversal of 1947431861411 is 1141681347491.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1947431861411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1947431861411.

It is not a weakly prime, because it can be changed into another prime (1947431861491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 973715930705 + 973715930706.

It is an arithmetic number, because the mean of its divisors is an integer number (973715930706).

Almost surely, 2^{1947431861411} is an apocalyptic number.

1947431861411 is a deficient number, since it is larger than the sum of its proper divisors (1).

1947431861411 is an equidigital number, since it uses as much as digits as its factorization.

1947431861411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 50.

The spelling of 1947431861411 in words is "one trillion, nine hundred forty-seven billion, four hundred thirty-one million, eight hundred sixty-one thousand, four hundred eleven".