8171428169 has 2 divisors, whose sum is σ = 8171428170. Its totient is φ = 8171428168.

The previous prime is 8171428163. The next prime is 8171428183. The reversal of 8171428169 is 9618241718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7636662544 + 534765625 = 87388^2 + 23125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8171428169 is a prime.

It is a super-2 number, since 2×8171428169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8171428163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4085714084 + 4085714085.

It is an arithmetic number, because the mean of its divisors is an integer number (4085714085).

Almost surely, 2^8171428169 is an apocalyptic number.

It is an amenable number.

8171428169 is a deficient number, since it is larger than the sum of its proper divisors (1).

8171428169 is an equidigital number, since it uses as much as digits as its factorization.

8171428169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 47.

The square root of 8171428169 is about 90395.9521715436. The cubic root of 8171428169 is about 2014.1848380903.

The spelling of 8171428169 in words is "eight billion, one hundred seventy-one million, four hundred twenty-eight thousand, one hundred sixty-nine".