94857809 has 2 divisors, whose sum is σ = 94857810. Its totient is φ = 94857808.

The previous prime is 94857767. The next prime is 94857817. The reversal of 94857809 is 90875849.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59336209 + 35521600 = 7703^2 + 5960^2 .

It is a cyclic number.

It is not a de Polignac number, because 94857809 - 2¹² = 94853713 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (94857839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47428904 + 47428905.

It is an arithmetic number, because the mean of its divisors is an integer number (47428905).

Almost surely, 2^94857809 is an apocalyptic number.

It is an amenable number.

94857809 is a deficient number, since it is larger than the sum of its proper divisors (1).

94857809 is an equidigital number, since it uses as much as digits as its factorization.

94857809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 94857809 is about 9739.4973689611. The cubic root of 94857809 is about 456.0624994487.

The spelling of 94857809 in words is "ninety-four million, eight hundred fifty-seven thousand, eight hundred nine".