8161258361 has 2 divisors, whose sum is σ = 8161258362. Its totient is φ = 8161258360.

The previous prime is 8161258351. The next prime is 8161258397. The reversal of 8161258361 is 1638521618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7870351225 + 290907136 = 88715^2 + 17056^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8161258361 is a prime.

It is a super-2 number, since 2×8161258361² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (8161258331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4080629180 + 4080629181.

It is an arithmetic number, because the mean of its divisors is an integer number (4080629181).

Almost surely, 2^8161258361 is an apocalyptic number.

It is an amenable number.

8161258361 is a deficient number, since it is larger than the sum of its proper divisors (1).

8161258361 is an equidigital number, since it uses as much as digits as its factorization.

8161258361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 8161258361 is about 90339.6832017912. The cubic root of 8161258361 is about 2013.3489019350.

Adding to 8161258361 its reverse (1638521618), we get a palindrome (9799779979).

The spelling of 8161258361 in words is "eight billion, one hundred sixty-one million, two hundred fifty-eight thousand, three hundred sixty-one".