71309293445 has 16 divisors (see below), whose sum is σ = 92330470512. Its totient is φ = 52558072320.

The previous prime is 71309293441. The next prime is 71309293453. The reversal of 71309293445 is 54439290317.

It is a happy number.

It is a Cunningham number, because it is equal to 267038²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 18380309476 + 52928983969 = 135574^2 + 230063^2 .

It is not a de Polignac number, because 71309293445 - 2² = 71309293441 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 71309293445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71309293441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1018982 + ... + 1086711.

It is an arithmetic number, because the mean of its divisors is an integer number (5770654407).

Almost surely, 2^71309293445 is an apocalyptic number.

It is an amenable number.

71309293445 is a deficient number, since it is larger than the sum of its proper divisors (21021177067).

71309293445 is a wasteful number, since it uses less digits than its factorization.

71309293445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106232.

The product of its (nonzero) digits is 816480, while the sum is 47.

The spelling of 71309293445 in words is "seventy-one billion, three hundred nine million, two hundred ninety-three thousand, four hundred forty-five".