80658509 has 2 divisors, whose sum is σ = 80658510. Its totient is φ = 80658508.

The previous prime is 80658491. The next prime is 80658511. The reversal of 80658509 is 90585608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57714409 + 22944100 = 7597^2 + 4790^2 .

It is a cyclic number.

It is not a de Polignac number, because 80658509 - 2¹⁶ = 80592973 is a prime.

Together with 80658511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80658709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40329254 + 40329255.

It is an arithmetic number, because the mean of its divisors is an integer number (40329255).

Almost surely, 2^80658509 is an apocalyptic number.

It is an amenable number.

80658509 is a deficient number, since it is larger than the sum of its proper divisors (1).

80658509 is an equidigital number, since it uses as much as digits as its factorization.

80658509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 80658509 is about 8981.0082396132. The cubic root of 80658509 is about 432.0659710778.

The spelling of 80658509 in words is "eighty million, six hundred fifty-eight thousand, five hundred nine".