79221019 has 4 divisors (see below), whose sum is σ = 80336880. Its totient is φ = 78105160.

The previous prime is 79220983. The next prime is 79221029. The reversal of 79221019 is 91012297.

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 79221019 - 2⁷ = 79220891 is a prime.

It is a super-2 number, since 2×79221019² = 12551939702796722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79221029) 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, 557824 + ... + 557965.

It is an arithmetic number, because the mean of its divisors is an integer number (20084220).

Almost surely, 2^79221019 is an apocalyptic number.

79221019 is a deficient number, since it is larger than the sum of its proper divisors (1115861).

79221019 is a wasteful number, since it uses less digits than its factorization.

79221019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115860.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 79221019 is about 8900.6190234163. The cubic root of 79221019 is about 429.4838208559.

The spelling of 79221019 in words is "seventy-nine million, two hundred twenty-one thousand, nineteen".