80721097 has 2 divisors, whose sum is σ = 80721098. Its totient is φ = 80721096.

The previous prime is 80721077. The next prime is 80721133. The reversal of 80721097 is 79012708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56010256 + 24710841 = 7484^2 + 4971^2 .

It is a cyclic number.

It is not a de Polignac number, because 80721097 - 2¹⁵ = 80688329 is a prime.

It is not a weakly prime, because it can be changed into another prime (80721037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40360548 + 40360549.

It is an arithmetic number, because the mean of its divisors is an integer number (40360549).

Almost surely, 2^80721097 is an apocalyptic number.

It is an amenable number.

80721097 is a deficient number, since it is larger than the sum of its proper divisors (1).

80721097 is an equidigital number, since it uses as much as digits as its factorization.

80721097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 80721097 is about 8984.4920279335. The cubic root of 80721097 is about 432.1776978866.

It can be divided in two parts, 807 and 21097, that added together give a square (21904 = 148²).

The spelling of 80721097 in words is "eighty million, seven hundred twenty-one thousand, ninety-seven".