71305051909 has 48 divisors (see below), whose sum is σ = 90699147840. Its totient is φ = 55553299200.

The previous prime is 71305051901. The next prime is 71305051931. The reversal of 71305051909 is 90915050317.

It is not a de Polignac number, because 71305051909 - 2³ = 71305051901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71305051901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48871822 + ... + 48873280.

It is an arithmetic number, because the mean of its divisors is an integer number (1889565580).

Almost surely, 2^71305051909 is an apocalyptic number.

It is an amenable number.

71305051909 is a deficient number, since it is larger than the sum of its proper divisors (19394095931).

71305051909 is a wasteful number, since it uses less digits than its factorization.

71305051909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610 (or 2603 counting only the distinct ones).

The product of its (nonzero) digits is 42525, while the sum is 40.

The spelling of 71305051909 in words is "seventy-one billion, three hundred five million, fifty-one thousand, nine hundred nine".