8215129361 has 2 divisors, whose sum is σ = 8215129362. Its totient is φ = 8215129360.

The previous prime is 8215129333. The next prime is 8215129469. The reversal of 8215129361 is 1639215128.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5982094336 + 2233035025 = 77344^2 + 47255^2 .

It is a cyclic number.

It is not a de Polignac number, because 8215129361 - 2³⁰ = 7141387537 is a prime.

It is not a weakly prime, because it can be changed into another prime (8215129561) 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, 4107564680 + 4107564681.

It is an arithmetic number, because the mean of its divisors is an integer number (4107564681).

Almost surely, 2^8215129361 is an apocalyptic number.

It is an amenable number.

8215129361 is a deficient number, since it is larger than the sum of its proper divisors (1).

8215129361 is an equidigital number, since it uses as much as digits as its factorization.

8215129361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 8215129361 is about 90637.3508052834. The cubic root of 8215129361 is about 2017.7691086031.

The spelling of 8215129361 in words is "eight billion, two hundred fifteen million, one hundred twenty-nine thousand, three hundred sixty-one".