71195491789 has 4 divisors (see below), whose sum is σ = 71239962780. Its totient is φ = 71151020800.

The previous prime is 71195491781. The next prime is 71195491867. The reversal of 71195491789 is 98719459117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98719459117 = 60209 ⋅1639613.

It can be written as a sum of positive squares in 2 ways, for example, as 42679428100 + 28516063689 = 206590^2 + 168867^2 .

It is a cyclic number.

It is not a de Polignac number, because 71195491789 - 2³ = 71195491781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71195491781) 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, 22233094 + ... + 22236295.

It is an arithmetic number, because the mean of its divisors is an integer number (17809990695).

Almost surely, 2^71195491789 is an apocalyptic number.

It is an amenable number.

71195491789 is a deficient number, since it is larger than the sum of its proper divisors (44470991).

71195491789 is a wasteful number, since it uses less digits than its factorization.

71195491789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44470990.

The product of its digits is 5715360, while the sum is 61.

The spelling of 71195491789 in words is "seventy-one billion, one hundred ninety-five million, four hundred ninety-one thousand, seven hundred eighty-nine".