9891261473 has 2 divisors, whose sum is σ = 9891261474. Its totient is φ = 9891261472.

The previous prime is 9891261463. The next prime is 9891261529. The reversal of 9891261473 is 3741621989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6479767009 + 3411494464 = 80497^2 + 58408^2 .

It is a cyclic number.

It is not a de Polignac number, because 9891261473 - 2¹⁸ = 9890999329 is a prime.

It is not a weakly prime, because it can be changed into another prime (9891261463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4945630736 + 4945630737.

It is an arithmetic number, because the mean of its divisors is an integer number (4945630737).

Almost surely, 2^9891261473 is an apocalyptic number.

It is an amenable number.

9891261473 is a deficient number, since it is larger than the sum of its proper divisors (1).

9891261473 is an equidigital number, since it uses as much as digits as its factorization.

9891261473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 50.

The square root of 9891261473 is about 99454.8212657385. The cubic root of 9891261473 is about 2146.5972113243.

The spelling of 9891261473 in words is "nine billion, eight hundred ninety-one million, two hundred sixty-one thousand, four hundred seventy-three".