79975813 has 2 divisors, whose sum is σ = 79975814. Its totient is φ = 79975812.

The previous prime is 79975801. The next prime is 79975817. The reversal of 79975813 is 31857997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44715969 + 35259844 = 6687^2 + 5938^2 .

It is an emirp because it is prime and its reverse (31857997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79975813 - 2¹³ = 79967621 is a prime.

It is a super-2 number, since 2×79975813² = 12792261330021938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79975817) 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 as a sum of consecutive naturals, namely, 39987906 + 39987907.

It is an arithmetic number, because the mean of its divisors is an integer number (39987907).

Almost surely, 2^79975813 is an apocalyptic number.

It is an amenable number.

79975813 is a deficient number, since it is larger than the sum of its proper divisors (1).

79975813 is an equidigital number, since it uses as much as digits as its factorization.

79975813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 49.

The square root of 79975813 is about 8942.9197133822. The cubic root of 79975813 is about 430.8435092028.

It can be divided in two parts, 7997581 and 3, that added together give a square (7997584 = 2828²).

The spelling of 79975813 in words is "seventy-nine million, nine hundred seventy-five thousand, eight hundred thirteen".