9912182281 has 16 divisors (see below), whose sum is σ = 10948671360. Its totient is φ = 8941363200.

The previous prime is 9912182261. The next prime is 9912182309. The reversal of 9912182281 is 1822812199.

It is a 5-Lehmer number, since φ(9912182281) divides (9912182281-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 9912182281 - 2¹⁷ = 9912051209 is a prime.

It is a super-2 number, since 2×9912182281² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9912182221) 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, 144120 + ... + 201481.

It is an arithmetic number, because the mean of its divisors is an integer number (684291960).

Almost surely, 2^9912182281 is an apocalyptic number.

It is an amenable number.

9912182281 is a deficient number, since it is larger than the sum of its proper divisors (1036489079).

9912182281 is a wasteful number, since it uses less digits than its factorization.

9912182281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345696.

The product of its digits is 41472, while the sum is 43.

The square root of 9912182281 is about 99559.9431548653. The cubic root of 9912182281 is about 2148.1095537646.

The spelling of 9912182281 in words is "nine billion, nine hundred twelve million, one hundred eighty-two thousand, two hundred eighty-one".