83420809 has 2 divisors, whose sum is σ = 83420810. Its totient is φ = 83420808.

The previous prime is 83420801. The next prime is 83420837. The reversal of 83420809 is 90802438.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73359225 + 10061584 = 8565^2 + 3172^2 .

It is a cyclic number.

It is not a de Polignac number, because 83420809 - 2³ = 83420801 is a prime.

It is not a weakly prime, because it can be changed into another prime (83420801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41710404 + 41710405.

It is an arithmetic number, because the mean of its divisors is an integer number (41710405).

Almost surely, 2^83420809 is an apocalyptic number.

It is an amenable number.

83420809 is a deficient number, since it is larger than the sum of its proper divisors (1).

83420809 is an equidigital number, since it uses as much as digits as its factorization.

83420809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 83420809 is about 9133.4992746482. The cubic root of 83420809 is about 436.9430129893.

The spelling of 83420809 in words is "eighty-three million, four hundred twenty thousand, eight hundred nine".