9985191281 has 16 divisors (see below), whose sum is σ = 11389682304. Its totient is φ = 8671981824.

The previous prime is 9985191269. The next prime is 9985191283. The reversal of 9985191281 is 1821915899.

It is a cyclic number.

It is not a de Polignac number, because 9985191281 - 2⁶ = 9985191217 is a prime.

It is a super-2 number, since 2×9985191281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9985191283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 879020 + ... + 890306.

It is an arithmetic number, because the mean of its divisors is an integer number (711855144).

Almost surely, 2^9985191281 is an apocalyptic number.

It is an amenable number.

9985191281 is a deficient number, since it is larger than the sum of its proper divisors (1404491023).

9985191281 is a wasteful number, since it uses less digits than its factorization.

9985191281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15320.

The product of its digits is 466560, while the sum is 53.

The square root of 9985191281 is about 99925.9289724144. The cubic root of 9985191281 is about 2153.3706840424.

The spelling of 9985191281 in words is "nine billion, nine hundred eighty-five million, one hundred ninety-one thousand, two hundred eighty-one".