79813 has 2 divisors, whose sum is σ = 79814. Its totient is φ = 79812.

The previous prime is 79811. The next prime is 79817. The reversal of 79813 is 31897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79524 + 289 = 282^2 + 17^2 .

It is a cyclic number.

It is not a de Polignac number, because 79813 - 2¹ = 79811 is a prime.

It is a super-2 number, since 2×79813² = 12740229938, which contains 22 as substring.

Together with 79811, it forms a pair of twin primes.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39906 + 39907.

It is an arithmetic number, because the mean of its divisors is an integer number (39907).

2⁷⁹⁸¹³ is an apocalyptic number.

It is an amenable number.

79813 is a deficient number, since it is larger than the sum of its proper divisors (1).

79813 is an equidigital number, since it uses as much as digits as its factorization.

79813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 79813 is about 282.5119466500. The cubic root of 79813 is about 43.0550943335.

The spelling of 79813 in words is "seventy-nine thousand, eight hundred thirteen".