381878201 has 2 divisors, whose sum is σ = 381878202. Its totient is φ = 381878200.

The previous prime is 381878183. The next prime is 381878251. The reversal of 381878201 is 102878183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243204025 + 138674176 = 15595^2 + 11776^2 .

It is a cyclic number.

It is not a de Polignac number, because 381878201 - 2¹⁴ = 381861817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381878251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190939100 + 190939101.

It is an arithmetic number, because the mean of its divisors is an integer number (190939101).

Almost surely, 2^381878201 is an apocalyptic number.

It is an amenable number.

381878201 is a deficient number, since it is larger than the sum of its proper divisors (1).

381878201 is an equidigital number, since it uses as much as digits as its factorization.

381878201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 381878201 is about 19541.7041477963. The cubic root of 381878201 is about 725.5070260678.

The spelling of 381878201 in words is "three hundred eighty-one million, eight hundred seventy-eight thousand, two hundred one".