4100809 has 2 divisors, whose sum is σ = 4100810. Its totient is φ = 4100808.

The previous prime is 4100807. The next prime is 4100813. The reversal of 4100809 is 9080014.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3822025 + 278784 = 1955^2 + 528^2 .

It is a cyclic number.

It is not a de Polignac number, because 4100809 - 2¹ = 4100807 is a prime.

Together with 4100807, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 4100809.

It is not a weakly prime, because it can be changed into another prime (4100807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2050404 + 2050405.

It is an arithmetic number, because the mean of its divisors is an integer number (2050405).

Almost surely, 2^4100809 is an apocalyptic number.

It is an amenable number.

4100809 is a deficient number, since it is larger than the sum of its proper divisors (1).

4100809 is an equidigital number, since it uses as much as digits as its factorization.

4100809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 4100809 is about 2025.0454315891. The cubic root of 4100809 is about 160.0625926978.

The spelling of 4100809 in words is "four million, one hundred thousand, eight hundred nine".