80839009 has 2 divisors, whose sum is σ = 80839010. Its totient is φ = 80839008.

The previous prime is 80839007. The next prime is 80839019. The reversal of 80839009 is 90093808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80496784 + 342225 = 8972^2 + 585^2 .

It is a cyclic number.

It is not a de Polignac number, because 80839009 - 2¹ = 80839007 is a prime.

It is a super-2 number, since 2×80839009² = 13069890752204162, which contains 22 as substring.

Together with 80839007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (80839007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40419504 + 40419505.

It is an arithmetic number, because the mean of its divisors is an integer number (40419505).

Almost surely, 2^80839009 is an apocalyptic number.

It is an amenable number.

80839009 is a deficient number, since it is larger than the sum of its proper divisors (1).

80839009 is an equidigital number, since it uses as much as digits as its factorization.

80839009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 80839009 is about 8991.0516070146. The cubic root of 80839009 is about 432.3880276362.

The spelling of 80839009 in words is "eighty million, eight hundred thirty-nine thousand, nine".