9861479897391 has 6 divisors (see below), whose sum is σ = 14244359851800. Its totient is φ = 6574319931588.

The previous prime is 9861479897317. The next prime is 9861479897411. The reversal of 9861479897391 is 1937989741689.

9861479897391 is a `hidden beast` number, since 9 + 8 + 6 + 147 + 9 + 89 + 7 + 391 = 666.

It is not a de Polignac number, because 9861479897391 - 2⁷ = 9861479897263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9861479897391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9861479897491) 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 in 5 ways as a sum of consecutive naturals, for example, 547859994291 + ... + 547859994308.

It is an arithmetic number, because the mean of its divisors is an integer number (2374059975300).

Almost surely, 2^{9861479897391} is an apocalyptic number.

9861479897391 is a deficient number, since it is larger than the sum of its proper divisors (4382879954409).

9861479897391 is a wasteful number, since it uses less digits than its factorization.

9861479897391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095719988605 (or 1095719988602 counting only the distinct ones).

The product of its digits is 1481421312, while the sum is 81.

The spelling of 9861479897391 in words is "nine trillion, eight hundred sixty-one billion, four hundred seventy-nine million, eight hundred ninety-seven thousand, three hundred ninety-one".