202100309 has 4 divisors (see below), whose sum is σ = 202204716. Its totient is φ = 201995904.

The previous prime is 202100303. The next prime is 202100323. The reversal of 202100309 is 903001202.

202100309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903001202 = 2 ⋅451500601.

It can be written as a sum of positive squares in 2 ways, for example, as 94148209 + 107952100 = 9703^2 + 10390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202100309 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 (202100303) 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, 49244 + ... + 53189.

It is an arithmetic number, because the mean of its divisors is an integer number (50551179).

Almost surely, 2^202100309 is an apocalyptic number.

It is an amenable number.

202100309 is a deficient number, since it is larger than the sum of its proper divisors (104407).

202100309 is a wasteful number, since it uses less digits than its factorization.

202100309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104406.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 202100309 is about 14216.1988238769. The cubic root of 202100309 is about 586.8435367984.

The spelling of 202100309 in words is "two hundred two million, one hundred thousand, three hundred nine".