10100809 has 2 divisors, whose sum is σ = 10100810. Its totient is φ = 10100808.

The previous prime is 10100803. The next prime is 10100813. The reversal of 10100809 is 90800101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5774409 + 4326400 = 2403^2 + 2080^2 .

It is a cyclic number.

It is not a de Polignac number, because 10100809 - 2⁵ = 10100777 is a prime.

It is not a weakly prime, because it can be changed into another prime (10100803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050404 + 5050405.

It is an arithmetic number, because the mean of its divisors is an integer number (5050405).

Almost surely, 2^10100809 is an apocalyptic number.

It is an amenable number.

10100809 is a deficient number, since it is larger than the sum of its proper divisors (1).

10100809 is an equidigital number, since it uses as much as digits as its factorization.

10100809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 10100809 is about 3178.1769931834. The cubic root of 10100809 is about 216.1650045206.

The spelling of 10100809 in words is "ten million, one hundred thousand, eight hundred nine".