71506391329 has 2 divisors, whose sum is σ = 71506391330. Its totient is φ = 71506391328.

The previous prime is 71506391293. The next prime is 71506391381. The reversal of 71506391329 is 92319360517.

Together with previous prime (71506391293) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41596418304 + 29909973025 = 203952^2 + 172945^2 .

It is a cyclic number.

It is not a de Polignac number, because 71506391329 - 2⁹ = 71506390817 is a prime.

It is a super-2 number, since 2×71506391329² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71506391399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35753195664 + 35753195665.

It is an arithmetic number, because the mean of its divisors is an integer number (35753195665).

Almost surely, 2^71506391329 is an apocalyptic number.

It is an amenable number.

71506391329 is a deficient number, since it is larger than the sum of its proper divisors (1).

71506391329 is an equidigital number, since it uses as much as digits as its factorization.

71506391329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 46.

The spelling of 71506391329 in words is "seventy-one billion, five hundred six million, three hundred ninety-one thousand, three hundred twenty-nine".