71289471245 has 4 divisors (see below), whose sum is σ = 85547365500. Its totient is φ = 57031576992.

The previous prime is 71289471229. The next prime is 71289471263. The reversal of 71289471245 is 54217498217.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38636619844 + 32652851401 = 196562^2 + 180701^2 .

It is a cyclic number.

It is not a de Polignac number, because 71289471245 - 2⁴ = 71289471229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71289471193 and 71289471202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7128947120 + ... + 7128947129.

It is an arithmetic number, because the mean of its divisors is an integer number (21386841375).

Almost surely, 2^71289471245 is an apocalyptic number.

It is an amenable number.

71289471245 is a deficient number, since it is larger than the sum of its proper divisors (14257894255).

71289471245 is a wasteful number, since it uses less digits than its factorization.

71289471245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14257894254.

The product of its digits is 1128960, while the sum is 50.

The spelling of 71289471245 in words is "seventy-one billion, two hundred eighty-nine million, four hundred seventy-one thousand, two hundred forty-five".