71920342939 has 4 divisors (see below), whose sum is σ = 72074348424. Its totient is φ = 71766337456.

The previous prime is 71920342937. The next prime is 71920342969. The reversal of 71920342939 is 93924302917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93924302917 = 577 ⋅162780421.

It is a cyclic number.

It is not a de Polignac number, because 71920342939 - 2¹ = 71920342937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71920342892 and 71920342901.

It is not an unprimeable number, because it can be changed into a prime (71920342937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77002042 + ... + 77002975.

It is an arithmetic number, because the mean of its divisors is an integer number (18018587106).

Almost surely, 2^71920342939 is an apocalyptic number.

71920342939 is a deficient number, since it is larger than the sum of its proper divisors (154005485).

71920342939 is a wasteful number, since it uses less digits than its factorization.

71920342939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154005484.

The product of its (nonzero) digits is 734832, while the sum is 49.

The spelling of 71920342939 in words is "seventy-one billion, nine hundred twenty million, three hundred forty-two thousand, nine hundred thirty-nine".