83439509 has 2 divisors, whose sum is σ = 83439510. Its totient is φ = 83439508.

The previous prime is 83439491. The next prime is 83439593. The reversal of 83439509 is 90593438.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45185284 + 38254225 = 6722^2 + 6185^2 .

It is a cyclic number.

It is not a de Polignac number, because 83439509 - 2²⁰ = 82390933 is a prime.

It is a super-2 number, since 2×83439509² = 13924303324322162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83439599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41719754 + 41719755.

It is an arithmetic number, because the mean of its divisors is an integer number (41719755).

Almost surely, 2^83439509 is an apocalyptic number.

It is an amenable number.

83439509 is a deficient number, since it is larger than the sum of its proper divisors (1).

83439509 is an equidigital number, since it uses as much as digits as its factorization.

83439509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 83439509 is about 9134.5229213134. The cubic root of 83439509 is about 436.9756596154.

The spelling of 83439509 in words is "eighty-three million, four hundred thirty-nine thousand, five hundred nine".