79681099 has 4 divisors (see below), whose sum is σ = 80803440. Its totient is φ = 78558760.

The previous prime is 79681073. The next prime is 79681103. The reversal of 79681099 is 99018697.

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

It is a cyclic number.

It is not a de Polignac number, because 79681099 - 2¹⁷ = 79550027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79681999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561064 + ... + 561205.

It is an arithmetic number, because the mean of its divisors is an integer number (20200860).

Almost surely, 2^79681099 is an apocalyptic number.

79681099 is a deficient number, since it is larger than the sum of its proper divisors (1122341).

79681099 is a wasteful number, since it uses less digits than its factorization.

79681099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122340.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 79681099 is about 8926.4270007658. The cubic root of 79681099 is about 430.3136327342.

The spelling of 79681099 in words is "seventy-nine million, six hundred eighty-one thousand, ninety-nine".