202142305 has 4 divisors (see below), whose sum is σ = 242570772. Its totient is φ = 161713840.

The previous prime is 202142299. The next prime is 202142323. The reversal of 202142305 is 503241202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503241202 = 2 ⋅251620601.

It can be written as a sum of positive squares in 2 ways, for example, as 156350016 + 45792289 = 12504^2 + 6767^2 .

It is a de Polignac number, because none of the positive numbers 2^k-202142305 is a prime.

It is a super-2 number, since 2×202142305² = 81723022941426050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20214226 + ... + 20214235.

It is an arithmetic number, because the mean of its divisors is an integer number (60642693).

Almost surely, 2^202142305 is an apocalyptic number.

It is an amenable number.

202142305 is a deficient number, since it is larger than the sum of its proper divisors (40428467).

202142305 is an equidigital number, since it uses as much as digits as its factorization.

202142305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40428466.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 202142305 is about 14217.6757945875. The cubic root of 202142305 is about 586.8841822489.

Adding to 202142305 its reverse (503241202), we get a palindrome (705383507).

The spelling of 202142305 in words is "two hundred two million, one hundred forty-two thousand, three hundred five".