8219490161 has 2 divisors, whose sum is σ = 8219490162. Its totient is φ = 8219490160.

The previous prime is 8219490137. The next prime is 8219490179. The reversal of 8219490161 is 1610949128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5661659536 + 2557830625 = 75244^2 + 50575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8219490161 is a prime.

It is not a weakly prime, because it can be changed into another prime (8219490101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4109745080 + 4109745081.

It is an arithmetic number, because the mean of its divisors is an integer number (4109745081).

Almost surely, 2^8219490161 is an apocalyptic number.

It is an amenable number.

8219490161 is a deficient number, since it is larger than the sum of its proper divisors (1).

8219490161 is an equidigital number, since it uses as much as digits as its factorization.

8219490161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 8219490161 is about 90661.4039214042. The cubic root of 8219490161 is about 2018.1260732015.

The spelling of 8219490161 in words is "eight billion, two hundred nineteen million, four hundred ninety thousand, one hundred sixty-one".