83689409 has 2 divisors, whose sum is σ = 83689410. Its totient is φ = 83689408.

The previous prime is 83689399. The next prime is 83689423. The reversal of 83689409 is 90498638.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68890000 + 14799409 = 8300^2 + 3847^2 .

It is a cyclic number.

It is not a de Polignac number, because 83689409 - 2⁴ = 83689393 is a prime.

It is not a weakly prime, because it can be changed into another prime (83689009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41844704 + 41844705.

It is an arithmetic number, because the mean of its divisors is an integer number (41844705).

Almost surely, 2^83689409 is an apocalyptic number.

It is an amenable number.

83689409 is a deficient number, since it is larger than the sum of its proper divisors (1).

83689409 is an equidigital number, since it uses as much as digits as its factorization.

83689409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 83689409 is about 9148.1915699224. The cubic root of 83689409 is about 437.4114698690.

The spelling of 83689409 in words is "eighty-three million, six hundred eighty-nine thousand, four hundred nine".