80218409 has 2 divisors, whose sum is σ = 80218410. Its totient is φ = 80218408.

The previous prime is 80218381. The next prime is 80218433. The reversal of 80218409 is 90481208.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43191184 + 37027225 = 6572^2 + 6085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80218409 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (80215409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40109204 + 40109205.

It is an arithmetic number, because the mean of its divisors is an integer number (40109205).

Almost surely, 2^80218409 is an apocalyptic number.

It is an amenable number.

80218409 is a deficient number, since it is larger than the sum of its proper divisors (1).

80218409 is an equidigital number, since it uses as much as digits as its factorization.

80218409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 80218409 is about 8956.4730223453. The cubic root of 80218409 is about 431.2787049716.

The spelling of 80218409 in words is "eighty million, two hundred eighteen thousand, four hundred nine".