80726221 has 2 divisors, whose sum is σ = 80726222. Its totient is φ = 80726220.

The previous prime is 80726197. The next prime is 80726237. The reversal of 80726221 is 12262708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54316900 + 26409321 = 7370^2 + 5139^2 .

It is a cyclic number.

It is not a de Polignac number, because 80726221 - 2⁵ = 80726189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80726221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80726521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40363110 + 40363111.

It is an arithmetic number, because the mean of its divisors is an integer number (40363111).

Almost surely, 2^80726221 is an apocalyptic number.

It is an amenable number.

80726221 is a deficient number, since it is larger than the sum of its proper divisors (1).

80726221 is an equidigital number, since it uses as much as digits as its factorization.

80726221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 80726221 is about 8984.7771814330. Note that the first 3 decimals coincide. The cubic root of 80726221 is about 432.1868422605.

Adding to 80726221 its reverse (12262708), we get a palindrome (92988929).

It can be divided in two parts, 807 and 26221, that added together give a triangular number (27028 = T₂₃₂).

The spelling of 80726221 in words is "eighty million, seven hundred twenty-six thousand, two hundred twenty-one".