71505144349 has 2 divisors, whose sum is σ = 71505144350. Its totient is φ = 71505144348.

The previous prime is 71505144317. The next prime is 71505144413. The reversal of 71505144349 is 94344150517.

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., 70765576324 + 739568025 = 266018^2 + 27195^2 .

It is an emirp because it is prime and its reverse (94344150517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71505144349 - 2⁵ = 71505144317 is a prime.

It is a super-2 number, since 2×71505144349² (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 (71505144049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35752572174 + 35752572175.

It is an arithmetic number, because the mean of its divisors is an integer number (35752572175).

Almost surely, 2^71505144349 is an apocalyptic number.

It is an amenable number.

71505144349 is a deficient number, since it is larger than the sum of its proper divisors (1).

71505144349 is an equidigital number, since it uses as much as digits as its factorization.

71505144349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 71505144349 in words is "seventy-one billion, five hundred five million, one hundred forty-four thousand, three hundred forty-nine".