41172809 has 2 divisors, whose sum is σ = 41172810. Its totient is φ = 41172808.

The previous prime is 41172797. The next prime is 41172811. The reversal of 41172809 is 90827114.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30913600 + 10259209 = 5560^2 + 3203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-41172809 is a prime.

It is a Sophie Germain prime.

Together with 41172811, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (41172839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20586404 + 20586405.

It is an arithmetic number, because the mean of its divisors is an integer number (20586405).

Almost surely, 2^41172809 is an apocalyptic number.

It is an amenable number.

41172809 is a deficient number, since it is larger than the sum of its proper divisors (1).

41172809 is an equidigital number, since it uses as much as digits as its factorization.

41172809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 41172809 is about 6416.6041641978. The cubic root of 41172809 is about 345.3055026898.

The spelling of 41172809 in words is "forty-one million, one hundred seventy-two thousand, eight hundred nine".