83870609 has 2 divisors, whose sum is σ = 83870610. Its totient is φ = 83870608.

The previous prime is 83870603. The next prime is 83870641. The reversal of 83870609 is 90607838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51437584 + 32433025 = 7172^2 + 5695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83870609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83870603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41935304 + 41935305.

It is an arithmetic number, because the mean of its divisors is an integer number (41935305).

Almost surely, 2^83870609 is an apocalyptic number.

It is an amenable number.

83870609 is a deficient number, since it is larger than the sum of its proper divisors (1).

83870609 is an equidigital number, since it uses as much as digits as its factorization.

83870609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 83870609 is about 9158.0898117457. The cubic root of 83870609 is about 437.7269292385.

The spelling of 83870609 in words is "eighty-three million, eight hundred seventy thousand, six hundred nine".