84950809 has 2 divisors, whose sum is σ = 84950810. Its totient is φ = 84950808.

The previous prime is 84950807. The next prime is 84950837. The reversal of 84950809 is 90805948.

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., 81721600 + 3229209 = 9040^2 + 1797^2 .

It is a cyclic number.

It is not a de Polignac number, because 84950809 - 2¹ = 84950807 is a prime.

Together with 84950807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (84950807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42475404 + 42475405.

It is an arithmetic number, because the mean of its divisors is an integer number (42475405).

Almost surely, 2^84950809 is an apocalyptic number.

It is an amenable number.

84950809 is a deficient number, since it is larger than the sum of its proper divisors (1).

84950809 is an equidigital number, since it uses as much as digits as its factorization.

84950809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 84950809 is about 9216.8763146741. The cubic root of 84950809 is about 439.5981334180.

The spelling of 84950809 in words is "eighty-four million, nine hundred fifty thousand, eight hundred nine".