8521197229 has 2 divisors, whose sum is σ = 8521197230. Its totient is φ = 8521197228.

The previous prime is 8521197187. The next prime is 8521197247. The reversal of 8521197229 is 9227911258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8485173225 + 36024004 = 92115^2 + 6002^2 .

It is a cyclic number.

It is not a de Polignac number, because 8521197229 - 2³¹ = 6373713581 is a prime.

It is a super-2 number, since 2×8521197229² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8521197029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260598614 + 4260598615.

It is an arithmetic number, because the mean of its divisors is an integer number (4260598615).

Almost surely, 2^8521197229 is an apocalyptic number.

It is an amenable number.

8521197229 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521197229 is an equidigital number, since it uses as much as digits as its factorization.

8521197229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 46.

The square root of 8521197229 is about 92310.3311065452. The cubic root of 8521197229 is about 2042.5226089313.

The spelling of 8521197229 in words is "eight billion, five hundred twenty-one million, one hundred ninety-seven thousand, two hundred twenty-nine".