100820909 has 4 divisors (see below), whose sum is σ = 115223904. Its totient is φ = 86417916.

The previous prime is 100820809. The next prime is 100820933. The reversal of 100820909 is 909028001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100820909 - 2¹² = 100816813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100820989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7201487 + ... + 7201500.

It is an arithmetic number, because the mean of its divisors is an integer number (28805976).

Almost surely, 2^100820909 is an apocalyptic number.

It is an amenable number.

100820909 is a deficient number, since it is larger than the sum of its proper divisors (14402995).

100820909 is an equidigital number, since it uses as much as digits as its factorization.

100820909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14402994.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 100820909 is about 10040.9615575402. The cubic root of 100820909 is about 465.4255309994.

The spelling of 100820909 in words is "one hundred million, eight hundred twenty thousand, nine hundred nine".