381518017 has 2 divisors, whose sum is σ = 381518018. Its totient is φ = 381518016.

The previous prime is 381517999. The next prime is 381518041. The reversal of 381518017 is 710815183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378263601 + 3254416 = 19449^2 + 1804^2 .

It is a cyclic number.

It is not a de Polignac number, because 381518017 - 2⁷ = 381517889 is a prime.

It is a super-2 number, since 2×381518017² = 291111994591224578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (381518047) 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, 190759008 + 190759009.

It is an arithmetic number, because the mean of its divisors is an integer number (190759009).

Almost surely, 2^381518017 is an apocalyptic number.

It is an amenable number.

381518017 is a deficient number, since it is larger than the sum of its proper divisors (1).

381518017 is an equidigital number, since it uses as much as digits as its factorization.

381518017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 34.

The square root of 381518017 is about 19532.4861960786. The cubic root of 381518017 is about 725.2788571367.

The spelling of 381518017 in words is "three hundred eighty-one million, five hundred eighteen thousand, seventeen".