100109809 has 2 divisors, whose sum is σ = 100109810. Its totient is φ = 100109808.

The previous prime is 100109783. The next prime is 100109831. The reversal of 100109809 is 908901001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99201600 + 908209 = 9960^2 + 953^2 .

It is a cyclic number.

It is not a de Polignac number, because 100109809 - 2¹⁷ = 99978737 is a prime.

It is not a weakly prime, because it can be changed into another prime (100109899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50054904 + 50054905.

It is an arithmetic number, because the mean of its divisors is an integer number (50054905).

Almost surely, 2^100109809 is an apocalyptic number.

It is an amenable number.

100109809 is a deficient number, since it is larger than the sum of its proper divisors (1).

100109809 is an equidigital number, since it uses as much as digits as its factorization.

100109809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 100109809 is about 10005.4889435749. The cubic root of 100109809 is about 464.3287172882.

The spelling of 100109809 in words is "one hundred million, one hundred nine thousand, eight hundred nine".