517000381 has 4 divisors (see below), whose sum is σ = 524082652. Its totient is φ = 509918112.

The previous prime is 517000369. The next prime is 517000387. The reversal of 517000381 is 183000715.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95355225 + 421645156 = 9765^2 + 20534^2 .

It is a cyclic number.

It is not a de Polignac number, because 517000381 - 2¹¹ = 516998333 is a prime.

It is a super-2 number, since 2×517000381² = 534578787908290322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517000387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3541026 + ... + 3541171.

It is an arithmetic number, because the mean of its divisors is an integer number (131020663).

Almost surely, 2^517000381 is an apocalyptic number.

It is an amenable number.

517000381 is a deficient number, since it is larger than the sum of its proper divisors (7082271).

517000381 is an equidigital number, since it uses as much as digits as its factorization.

517000381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7082270.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 517000381 is about 22737.6423799830. The cubic root of 517000381 is about 802.5959324115.

The spelling of 517000381 in words is "five hundred seventeen million, three hundred eighty-one", and thus it is an aban number.