71057321393 has 2 divisors, whose sum is σ = 71057321394. Its totient is φ = 71057321392.

The previous prime is 71057321383. The next prime is 71057321407. The reversal of 71057321393 is 39312375017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39167576464 + 31889744929 = 197908^2 + 178577^2 .

It is a cyclic number.

It is not a de Polignac number, because 71057321393 - 2¹² = 71057317297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71057321393.

It is not a weakly prime, because it can be changed into another prime (71057321333) 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, 35528660696 + 35528660697.

It is an arithmetic number, because the mean of its divisors is an integer number (35528660697).

Almost surely, 2^71057321393 is an apocalyptic number.

It is an amenable number.

71057321393 is a deficient number, since it is larger than the sum of its proper divisors (1).

71057321393 is an equidigital number, since it uses as much as digits as its factorization.

71057321393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 119070, while the sum is 41.

The spelling of 71057321393 in words is "seventy-one billion, fifty-seven million, three hundred twenty-one thousand, three hundred ninety-three".