79391969 has 4 divisors (see below), whose sum is σ = 79428144. Its totient is φ = 79355796.

The previous prime is 79391957. The next prime is 79391981. The reversal of 79391969 is 96919397.

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 an interprime number because it is at equal distance from previous prime (79391957) and next prime (79391981).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79391969 is a prime.

It is a super-2 number, since 2×79391969² = 12606169483393922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79391969.

It is not an unprimeable number, because it can be changed into a prime (79391869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14567 + ... + 19260.

It is an arithmetic number, because the mean of its divisors is an integer number (19857036).

Almost surely, 2^79391969 is an apocalyptic number.

It is an amenable number.

79391969 is a deficient number, since it is larger than the sum of its proper divisors (36175).

79391969 is a wasteful number, since it uses less digits than its factorization.

79391969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36174.

The product of its digits is 826686, while the sum is 53.

The square root of 79391969 is about 8910.2171129552. The cubic root of 79391969 is about 429.7925247514.

The spelling of 79391969 in words is "seventy-nine million, three hundred ninety-one thousand, nine hundred sixty-nine".