202643381 has 2 divisors, whose sum is σ = 202643382. Its totient is φ = 202643380.

The previous prime is 202643369. The next prime is 202643423. The reversal of 202643381 is 183346202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189502756 + 13140625 = 13766^2 + 3625^2 .

It is a cyclic number.

It is not a de Polignac number, because 202643381 - 2¹⁴ = 202626997 is a prime.

It is a super-2 number, since 2×202643381² = 82128679726222322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202643321) 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 as a sum of consecutive naturals, namely, 101321690 + 101321691.

It is an arithmetic number, because the mean of its divisors is an integer number (101321691).

Almost surely, 2^202643381 is an apocalyptic number.

It is an amenable number.

202643381 is a deficient number, since it is larger than the sum of its proper divisors (1).

202643381 is an equidigital number, since it uses as much as digits as its factorization.

202643381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 202643381 is about 14235.2864741107. The cubic root of 202643381 is about 587.3687104243.

Adding to 202643381 its reverse (183346202), we get a palindrome (385989583).

The spelling of 202643381 in words is "two hundred two million, six hundred forty-three thousand, three hundred eighty-one".