71506391293 has 2 divisors, whose sum is σ = 71506391294. Its totient is φ = 71506391292.

The previous prime is 71506391279. The next prime is 71506391329. The reversal of 71506391293 is 39219360517.

Together with next prime (71506391329) 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., 35941334724 + 35565056569 = 189582^2 + 188587^2 .

It is an emirp because it is prime and its reverse (39219360517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71506391293 - 2⁵ = 71506391261 is a prime.

It is a super-2 number, since 2×71506391293² (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 (71506391093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35753195646 + 35753195647.

It is an arithmetic number, because the mean of its divisors is an integer number (35753195647).

Almost surely, 2^71506391293 is an apocalyptic number.

It is an amenable number.

71506391293 is a deficient number, since it is larger than the sum of its proper divisors (1).

71506391293 is an equidigital number, since it uses as much as digits as its factorization.

71506391293 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 71506391293 in words is "seventy-one billion, five hundred six million, three hundred ninety-one thousand, two hundred ninety-three".