71143318349 has 2 divisors, whose sum is σ = 71143318350. Its totient is φ = 71143318348.

The previous prime is 71143318321. The next prime is 71143318369. The reversal of 71143318349 is 94381334117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65079581449 + 6063736900 = 255107^2 + 77870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71143318349 is a prime.

It is a super-2 number, since 2×71143318349² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71143318369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35571659174 + 35571659175.

It is an arithmetic number, because the mean of its divisors is an integer number (35571659175).

Almost surely, 2^71143318349 is an apocalyptic number.

It is an amenable number.

71143318349 is a deficient number, since it is larger than the sum of its proper divisors (1).

71143318349 is an equidigital number, since it uses as much as digits as its factorization.

71143318349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The spelling of 71143318349 in words is "seventy-one billion, one hundred forty-three million, three hundred eighteen thousand, three hundred forty-nine".