8161272709 has 2 divisors, whose sum is σ = 8161272710. Its totient is φ = 8161272708.

The previous prime is 8161272697. The next prime is 8161272727. The reversal of 8161272709 is 9072721618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7890768900 + 270503809 = 88830^2 + 16447^2 .

It is a cyclic number.

It is not a de Polignac number, because 8161272709 - 2²³ = 8152884101 is a prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8161278709) 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, 4080636354 + 4080636355.

It is an arithmetic number, because the mean of its divisors is an integer number (4080636355).

Almost surely, 2^8161272709 is an apocalyptic number.

It is an amenable number.

8161272709 is a deficient number, since it is larger than the sum of its proper divisors (1).

8161272709 is an equidigital number, since it uses as much as digits as its factorization.

8161272709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 8161272709 is about 90339.7626131484. The cubic root of 8161272709 is about 2013.3500817985.

The spelling of 8161272709 in words is "eight billion, one hundred sixty-one million, two hundred seventy-two thousand, seven hundred nine".