202104409 has 4 divisors (see below), whose sum is σ = 217650916. Its totient is φ = 186557904.

The previous prime is 202104391. The next prime is 202104431. The reversal of 202104409 is 904401202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 904401202 = 2 ⋅452200601.

It can be written as a sum of positive squares in 2 ways, for example, as 51796809 + 150307600 = 7197^2 + 12260^2 .

It is not a de Polignac number, because 202104409 - 2⁵ = 202104377 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 202104409.

It is not an unprimeable number, because it can be changed into a prime (202104479) 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, 7773234 + ... + 7773259.

It is an arithmetic number, because the mean of its divisors is an integer number (54412729).

Almost surely, 2^202104409 is an apocalyptic number.

It is an amenable number.

202104409 is a deficient number, since it is larger than the sum of its proper divisors (15546507).

202104409 is a wasteful number, since it uses less digits than its factorization.

202104409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15546506.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 202104409 is about 14216.3430248429. The cubic root of 202104409 is about 586.8475051945.

The spelling of 202104409 in words is "two hundred two million, one hundred four thousand, four hundred nine".