71955717931 has 4 divisors (see below), whose sum is σ = 75742861000. Its totient is φ = 68168574864.

The previous prime is 71955717923. The next prime is 71955717949. The reversal of 71955717931 is 13971755917.

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

It is a cyclic number.

It is not a de Polignac number, because 71955717931 - 2³ = 71955717923 is a prime.

It is a super-2 number, since 2×71955717931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71955747931) 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 3 ways as a sum of consecutive naturals, for example, 1893571506 + ... + 1893571543.

It is an arithmetic number, because the mean of its divisors is an integer number (18935715250).

Almost surely, 2^71955717931 is an apocalyptic number.

71955717931 is a deficient number, since it is larger than the sum of its proper divisors (3787143069).

71955717931 is a wasteful number, since it uses less digits than its factorization.

71955717931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3787143068.

The product of its digits is 2083725, while the sum is 55.

The spelling of 71955717931 in words is "seventy-one billion, nine hundred fifty-five million, seven hundred seventeen thousand, nine hundred thirty-one".