83681789 has 2 divisors, whose sum is σ = 83681790. Its totient is φ = 83681788.

The previous prime is 83681783. The next prime is 83681821. The reversal of 83681789 is 98718638.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83576164 + 105625 = 9142^2 + 325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83681789 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83681783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41840894 + 41840895.

It is an arithmetic number, because the mean of its divisors is an integer number (41840895).

Almost surely, 2^83681789 is an apocalyptic number.

It is an amenable number.

83681789 is a deficient number, since it is larger than the sum of its proper divisors (1).

83681789 is an equidigital number, since it uses as much as digits as its factorization.

83681789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 83681789 is about 9147.7750846859. The cubic root of 83681789 is about 437.3981938898.

The spelling of 83681789 in words is "eighty-three million, six hundred eighty-one thousand, seven hundred eighty-nine".