83916809 has 2 divisors, whose sum is σ = 83916810. Its totient is φ = 83916808.

The previous prime is 83916799. The next prime is 83916823. The reversal of 83916809 is 90861938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81956809 + 1960000 = 9053^2 + 1400^2 .

It is a cyclic number.

It is not a de Polignac number, because 83916809 - 2⁴ = 83916793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83916809.

It is not a weakly prime, because it can be changed into another prime (83916829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41958404 + 41958405.

It is an arithmetic number, because the mean of its divisors is an integer number (41958405).

Almost surely, 2^83916809 is an apocalyptic number.

It is an amenable number.

83916809 is a deficient number, since it is larger than the sum of its proper divisors (1).

83916809 is an equidigital number, since it uses as much as digits as its factorization.

83916809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 83916809 is about 9160.6118245453. The cubic root of 83916809 is about 437.8072882273.

The spelling of 83916809 in words is "eighty-three million, nine hundred sixteen thousand, eight hundred nine".