9427179721 has 2 divisors, whose sum is σ = 9427179722. Its totient is φ = 9427179720.

The previous prime is 9427179689. The next prime is 9427179739. The reversal of 9427179721 is 1279717249.

9427179721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8489595321 + 937584400 = 92139^2 + 30620^2 .

It is a cyclic number.

It is not a de Polignac number, because 9427179721 - 2⁵ = 9427179689 is a prime.

It is not a weakly prime, because it can be changed into another prime (9427119721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4713589860 + 4713589861.

It is an arithmetic number, because the mean of its divisors is an integer number (4713589861).

Almost surely, 2^9427179721 is an apocalyptic number.

It is an amenable number.

9427179721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9427179721 is an equidigital number, since it uses as much as digits as its factorization.

9427179721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 49.

The square root of 9427179721 is about 97093.6646800398. The cubic root of 9427179721 is about 2112.4864349630.

The spelling of 9427179721 in words is "nine billion, four hundred twenty-seven million, one hundred seventy-nine thousand, seven hundred twenty-one".