79769 has 2 divisors, whose sum is σ = 79770. Its totient is φ = 79768.

The previous prime is 79757. The next prime is 79777. The reversal of 79769 is 96797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78400 + 1369 = 280^2 + 37^2 .

It is an emirp because it is prime and its reverse (96797) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79769 is a prime.

It is a super-2 number, since 2×79769² = 12726186722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (79669) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39884 + 39885.

It is an arithmetic number, because the mean of its divisors is an integer number (39885).

2⁷⁹⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

79769 is a deficient number, since it is larger than the sum of its proper divisors (1).

79769 is an equidigital number, since it uses as much as digits as its factorization.

79769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 38.

The square root of 79769 is about 282.4340631015. The cubic root of 79769 is about 43.0471809511.

Subtracting from 79769 its product of digits (23814), we obtain a palindrome (55955).

It can be divided in two parts, 79 and 769, that added together give a palindrome (848).

The spelling of 79769 in words is "seventy-nine thousand, seven hundred sixty-nine".