79884561 has 4 divisors (see below), whose sum is σ = 106512752. Its totient is φ = 53256372.

The previous prime is 79884527. The next prime is 79884593. The reversal of 79884561 is 16548897.

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.

It is not a de Polignac number, because 79884561 - 2¹⁴ = 79868177 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 79884561.

It is not an unprimeable number, because it can be changed into a prime (79884521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13314091 + ... + 13314096.

It is an arithmetic number, because the mean of its divisors is an integer number (26628188).

Almost surely, 2^79884561 is an apocalyptic number.

It is an amenable number.

79884561 is a deficient number, since it is larger than the sum of its proper divisors (26628191).

79884561 is a wasteful number, since it uses less digits than its factorization.

79884561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26628190.

The product of its digits is 483840, while the sum is 48.

The square root of 79884561 is about 8937.8163440518. The cubic root of 79884561 is about 430.6795834159.

The spelling of 79884561 in words is "seventy-nine million, eight hundred eighty-four thousand, five hundred sixty-one".