9821972179 has 2 divisors, whose sum is σ = 9821972180. Its totient is φ = 9821972178.

The previous prime is 9821972131. The next prime is 9821972201. The reversal of 9821972179 is 9712791289.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9821972179 - 2⁷ = 9821972051 is a prime.

It is a super-2 number, since 2×9821972179² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9821972129) 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 as a sum of consecutive naturals, namely, 4910986089 + 4910986090.

It is an arithmetic number, because the mean of its divisors is an integer number (4910986090).

Almost surely, 2^9821972179 is an apocalyptic number.

9821972179 is a deficient number, since it is larger than the sum of its proper divisors (1).

9821972179 is an equidigital number, since it uses as much as digits as its factorization.

9821972179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 55.

The square root of 9821972179 is about 99105.8634945481. The cubic root of 9821972179 is about 2141.5730841279.

The spelling of 9821972179 in words is "nine billion, eight hundred twenty-one million, nine hundred seventy-two thousand, one hundred seventy-nine".