79039661 has 4 divisors (see below), whose sum is σ = 82476192. Its totient is φ = 75603132.

The previous prime is 79039651. The next prime is 79039663. The reversal of 79039661 is 16693097.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16693097 = 31 ⋅538487.

It is a cyclic number.

It is not a de Polignac number, because 79039661 - 2¹⁰ = 79038637 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 (79039663) 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, 1718231 + ... + 1718276.

It is an arithmetic number, because the mean of its divisors is an integer number (20619048).

Almost surely, 2^79039661 is an apocalyptic number.

It is an amenable number.

79039661 is a deficient number, since it is larger than the sum of its proper divisors (3436531).

79039661 is a wasteful number, since it uses less digits than its factorization.

79039661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436530.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 79039661 is about 8890.4252429229. The cubic root of 79039661 is about 429.1558361842.

The spelling of 79039661 in words is "seventy-nine million, thirty-nine thousand, six hundred sixty-one".