817530493 has 8 divisors (see below), whose sum is σ = 932206968. Its totient is φ = 710252544.

The previous prime is 817530463. The next prime is 817530523. The reversal of 817530493 is 394035718.

It is an interprime number because it is at equal distance from previous prime (817530463) and next prime (817530523).

It can be written as a sum of positive squares in 4 ways, for example, as 220314649 + 597215844 = 14843^2 + 24438^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-817530493 is a prime.

It is a super-2 number, since 2×817530493² = 1336712213969646098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817530443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1849396 + ... + 1849837.

It is an arithmetic number, because the mean of its divisors is an integer number (116525871).

Almost surely, 2^817530493 is an apocalyptic number.

It is an amenable number.

817530493 is a deficient number, since it is larger than the sum of its proper divisors (114676475).

817530493 is a wasteful number, since it uses less digits than its factorization.

817530493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699263.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 817530493 is about 28592.4901503874. The cubic root of 817530493 is about 935.0496100723.

The spelling of 817530493 in words is "eight hundred seventeen million, five hundred thirty thousand, four hundred ninety-three".