9471221729 has 2 divisors, whose sum is σ = 9471221730. Its totient is φ = 9471221728.

The previous prime is 9471221671. The next prime is 9471221731. The reversal of 9471221729 is 9271221749.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9317461729 + 153760000 = 96527^2 + 12400^2 .

It is a cyclic number.

It is not a de Polignac number, because 9471221729 - 2¹⁶ = 9471156193 is a prime.

Together with 9471221731, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9471221729.

It is not a weakly prime, because it can be changed into another prime (9471221429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4735610864 + 4735610865.

It is an arithmetic number, because the mean of its divisors is an integer number (4735610865).

Almost surely, 2^9471221729 is an apocalyptic number.

It is an amenable number.

9471221729 is a deficient number, since it is larger than the sum of its proper divisors (1).

9471221729 is an equidigital number, since it uses as much as digits as its factorization.

9471221729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 44.

The square root of 9471221729 is about 97320.2020600040. The cubic root of 9471221729 is about 2115.7710381541.

The spelling of 9471221729 in words is "nine billion, four hundred seventy-one million, two hundred twenty-one thousand, seven hundred twenty-nine".