35640809 has 2 divisors, whose sum is σ = 35640810. Its totient is φ = 35640808.

The previous prime is 35640799. The next prime is 35640811. The reversal of 35640809 is 90804653.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19998784 + 15642025 = 4472^2 + 3955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-35640809 is a prime.

Together with 35640811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (35640889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17820404 + 17820405.

It is an arithmetic number, because the mean of its divisors is an integer number (17820405).

Almost surely, 2^35640809 is an apocalyptic number.

It is an amenable number.

35640809 is a deficient number, since it is larger than the sum of its proper divisors (1).

35640809 is an equidigital number, since it uses as much as digits as its factorization.

35640809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 35640809 is about 5969.9923785546. The cubic root of 35640809 is about 329.0908831431.

The spelling of 35640809 in words is "thirty-five million, six hundred forty thousand, eight hundred nine".