80569249 has 2 divisors, whose sum is σ = 80569250. Its totient is φ = 80569248.

The previous prime is 80569219. The next prime is 80569283. The reversal of 80569249 is 94296508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60606225 + 19963024 = 7785^2 + 4468^2 .

It is a cyclic number.

It is not a de Polignac number, because 80569249 - 2⁷ = 80569121 is a prime.

It is not a weakly prime, because it can be changed into another prime (80569219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40284624 + 40284625.

It is an arithmetic number, because the mean of its divisors is an integer number (40284625).

Almost surely, 2^80569249 is an apocalyptic number.

It is an amenable number.

80569249 is a deficient number, since it is larger than the sum of its proper divisors (1).

80569249 is an equidigital number, since it uses as much as digits as its factorization.

80569249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 80569249 is about 8976.0374887809. The cubic root of 80569249 is about 431.9065316332.

The spelling of 80569249 in words is "eighty million, five hundred sixty-nine thousand, two hundred forty-nine".