80605813 has 2 divisors, whose sum is σ = 80605814. Its totient is φ = 80605812.

The previous prime is 80605793. The next prime is 80605817. The reversal of 80605813 is 31850608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80317444 + 288369 = 8962^2 + 537^2 .

It is a cyclic number.

It is not a de Polignac number, because 80605813 - 2⁵ = 80605781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80605817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40302906 + 40302907.

It is an arithmetic number, because the mean of its divisors is an integer number (40302907).

Almost surely, 2^80605813 is an apocalyptic number.

It is an amenable number.

80605813 is a deficient number, since it is larger than the sum of its proper divisors (1).

80605813 is an equidigital number, since it uses as much as digits as its factorization.

80605813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 80605813 is about 8978.0740139520. The cubic root of 80605813 is about 431.9718578061.

It can be divided in two parts, 80605 and 813, that added together give a palindrome (81418).

The spelling of 80605813 in words is "eighty million, six hundred five thousand, eight hundred thirteen".