100201909 has 4 divisors (see below), whose sum is σ = 102645900. Its totient is φ = 97757920.

The previous prime is 100201891. The next prime is 100201919. The reversal of 100201909 is 909102001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28121809 + 72080100 = 5303^2 + 8490^2 .

It is a cyclic number.

It is not a de Polignac number, because 100201909 - 2⁹ = 100201397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100201909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100201919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1221934 + ... + 1222015.

It is an arithmetic number, because the mean of its divisors is an integer number (25661475).

Almost surely, 2^100201909 is an apocalyptic number.

It is an amenable number.

100201909 is a deficient number, since it is larger than the sum of its proper divisors (2443991).

100201909 is an equidigital number, since it uses as much as digits as its factorization.

100201909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443990.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 100201909 is about 10010.0903592325. The cubic root of 100201909 is about 464.4710662003.

The spelling of 100201909 in words is "one hundred million, two hundred one thousand, nine hundred nine".