79841193781 has 4 divisors (see below), whose sum is σ = 80547753132. Its totient is φ = 79134634432.

The previous prime is 79841193743. The next prime is 79841193791. The reversal of 79841193781 is 18739114897.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17316191281 + 62525002500 = 131591^2 + 250050^2 .

It is a cyclic number.

It is not a de Polignac number, because 79841193781 - 2⁹ = 79841193269 is a prime.

It is a super-2 number, since 2×79841193781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79841193791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353279506 + ... + 353279731.

It is an arithmetic number, because the mean of its divisors is an integer number (20136938283).

Almost surely, 2^79841193781 is an apocalyptic number.

It is an amenable number.

79841193781 is a deficient number, since it is larger than the sum of its proper divisors (706559351).

79841193781 is a wasteful number, since it uses less digits than its factorization.

79841193781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706559350.

The product of its digits is 3048192, while the sum is 58.

The spelling of 79841193781 in words is "seventy-nine billion, eight hundred forty-one million, one hundred ninety-three thousand, seven hundred eighty-one".