71297853409 has 8 divisors (see below), whose sum is σ = 76729417128. Its totient is φ = 66003797760.

The previous prime is 71297853373. The next prime is 71297853469. The reversal of 71297853409 is 90435879217.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 170563600 + 71127289809 = 13060^2 + 266697^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71297853409 - 2⁹ = 71297852897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71297853409.

It is not an unprimeable number, because it can be changed into a prime (71297853469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34375942 + ... + 34378015.

It is an arithmetic number, because the mean of its divisors is an integer number (9591177141).

Almost surely, 2^71297853409 is an apocalyptic number.

It is an amenable number.

71297853409 is a deficient number, since it is larger than the sum of its proper divisors (5431563719).

71297853409 is a wasteful number, since it uses less digits than its factorization.

71297853409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68754035.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 71297853409 in words is "seventy-one billion, two hundred ninety-seven million, eight hundred fifty-three thousand, four hundred nine".