71109431979 has 4 divisors (see below), whose sum is σ = 94812575976. Its totient is φ = 47406287984.

The previous prime is 71109431969. The next prime is 71109431993. The reversal of 71109431979 is 97913490117.

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 71109431979 - 2¹³ = 71109423787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71109431969) 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 3 ways as a sum of consecutive naturals, for example, 11851571994 + ... + 11851571999.

It is an arithmetic number, because the mean of its divisors is an integer number (23703143994).

Almost surely, 2^71109431979 is an apocalyptic number.

71109431979 is a deficient number, since it is larger than the sum of its proper divisors (23703143997).

71109431979 is a wasteful number, since it uses less digits than its factorization.

71109431979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23703143996.

The product of its (nonzero) digits is 428652, while the sum is 51.

The spelling of 71109431979 in words is "seventy-one billion, one hundred nine million, four hundred thirty-one thousand, nine hundred seventy-nine".