9861117897 has 8 divisors (see below), whose sum is σ = 13190165344. Its totient is φ = 6553074528.

The previous prime is 9861117881. The next prime is 9861117899. The reversal of 9861117897 is 7987111689.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9861117897 - 2⁴ = 9861117881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9861117899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5249923 + ... + 5251800.

It is an arithmetic number, because the mean of its divisors is an integer number (1648770668).

Almost surely, 2^9861117897 is an apocalyptic number.

It is an amenable number.

9861117897 is a deficient number, since it is larger than the sum of its proper divisors (3329047447).

9861117897 is a wasteful number, since it uses less digits than its factorization.

9861117897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10502039.

The product of its digits is 1524096, while the sum is 57.

The square root of 9861117897 is about 99303.1615659844. The cubic root of 9861117897 is about 2144.4144105964.

The spelling of 9861117897 in words is "nine billion, eight hundred sixty-one million, one hundred seventeen thousand, eight hundred ninety-seven".