8121641819 has 2 divisors, whose sum is σ = 8121641820. Its totient is φ = 8121641818.

The previous prime is 8121641771. The next prime is 8121641833. The reversal of 8121641819 is 9181461218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8121641819 - 2¹⁶ = 8121576283 is a prime.

It is a super-2 number, since 2×8121641819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8121641839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060820909 + 4060820910.

It is an arithmetic number, because the mean of its divisors is an integer number (4060820910).

Almost surely, 2^8121641819 is an apocalyptic number.

8121641819 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121641819 is an equidigital number, since it uses as much as digits as its factorization.

8121641819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 41.

The square root of 8121641819 is about 90120.1521248161. The cubic root of 8121641819 is about 2010.0858703610.

The spelling of 8121641819 in words is "eight billion, one hundred twenty-one million, six hundred forty-one thousand, eight hundred nineteen".