381645503 has 2 divisors, whose sum is σ = 381645504. Its totient is φ = 381645502.

The previous prime is 381645487. The next prime is 381645547. The reversal of 381645503 is 305546183.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 381645503 - 2⁴ = 381645487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381645553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190822751 + 190822752.

It is an arithmetic number, because the mean of its divisors is an integer number (190822752).

Almost surely, 2^381645503 is an apocalyptic number.

381645503 is a deficient number, since it is larger than the sum of its proper divisors (1).

381645503 is an equidigital number, since it uses as much as digits as its factorization.

381645503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 381645503 is about 19535.7493585478. The cubic root of 381645503 is about 725.3596332287.

The spelling of 381645503 in words is "three hundred eighty-one million, six hundred forty-five thousand, five hundred three".