79969569 has 4 divisors (see below), whose sum is σ = 106626096. Its totient is φ = 53313044.

The previous prime is 79969531. The next prime is 79969573. The reversal of 79969569 is 96596997.

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 a cyclic number.

It is not a de Polignac number, because 79969569 - 2⁸ = 79969313 is a prime.

It is a super-2 number, since 2×79969569² = 12790263932091522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79969969) 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, 13328259 + ... + 13328264.

It is an arithmetic number, because the mean of its divisors is an integer number (26656524).

Almost surely, 2^79969569 is an apocalyptic number.

It is an amenable number.

79969569 is a deficient number, since it is larger than the sum of its proper divisors (26656527).

79969569 is a wasteful number, since it uses less digits than its factorization.

79969569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26656526.

The product of its digits is 8266860, while the sum is 60.

The square root of 79969569 is about 8942.5706035793. The cubic root of 79969569 is about 430.8322964091.

The spelling of 79969569 in words is "seventy-nine million, nine hundred sixty-nine thousand, five hundred sixty-nine".