202040381 has 2 divisors, whose sum is σ = 202040382. Its totient is φ = 202040380.

The previous prime is 202040353. The next prime is 202040389. The reversal of 202040381 is 183040202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201924100 + 116281 = 14210^2 + 341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202040381 is a prime.

It is a super-2 number, since 2×202040381² = 81640631109250322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202040389) 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, 101020190 + 101020191.

It is an arithmetic number, because the mean of its divisors is an integer number (101020191).

Almost surely, 2^202040381 is an apocalyptic number.

It is an amenable number.

202040381 is a deficient number, since it is larger than the sum of its proper divisors (1).

202040381 is an equidigital number, since it uses as much as digits as its factorization.

202040381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 202040381 is about 14214.0909311852. The cubic root of 202040381 is about 586.7855262716.

Adding to 202040381 its reverse (183040202), we get a palindrome (385080583).

The spelling of 202040381 in words is "two hundred two million, forty thousand, three hundred eighty-one".