79847081 has 4 divisors (see below), whose sum is σ = 79878612. Its totient is φ = 79815552.

The previous prime is 79847077. The next prime is 79847093. The reversal of 79847081 is 18074897.

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 45225625 + 34621456 = 6725^2 + 5884^2 .

It is a cyclic number.

It is not a de Polignac number, because 79847081 - 2² = 79847077 is a prime.

It is a super-2 number, since 2×79847081² = 12751112688441122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79847051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11600 + ... + 17153.

It is an arithmetic number, because the mean of its divisors is an integer number (19969653).

Almost surely, 2^79847081 is an apocalyptic number.

It is an amenable number.

79847081 is a deficient number, since it is larger than the sum of its proper divisors (31531).

79847081 is a wasteful number, since it uses less digits than its factorization.

79847081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31530.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 79847081 is about 8935.7193890587. The cubic root of 79847081 is about 430.6122178920.

The spelling of 79847081 in words is "seventy-nine million, eight hundred forty-seven thousand, eighty-one".