86172521069 has 2 divisors, whose sum is σ = 86172521070. Its totient is φ = 86172521068.

The previous prime is 86172521063. The next prime is 86172521089. The reversal of 86172521069 is 96012527168.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78240481225 + 7932039844 = 279715^2 + 89062^2 .

It is a cyclic number.

It is not a de Polignac number, because 86172521069 - 2¹⁶ = 86172455533 is a prime.

It is a super-2 number, since 2×86172521069² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86172521063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43086260534 + 43086260535.

It is an arithmetic number, because the mean of its divisors is an integer number (43086260535).

Almost surely, 2^86172521069 is an apocalyptic number.

It is an amenable number.

86172521069 is a deficient number, since it is larger than the sum of its proper divisors (1).

86172521069 is an equidigital number, since it uses as much as digits as its factorization.

86172521069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 86172521069 in words is "eighty-six billion, one hundred seventy-two million, five hundred twenty-one thousand, sixty-nine".