163540517 has 4 divisors (see below), whose sum is σ = 186903456. Its totient is φ = 140177580.

The previous prime is 163540499. The next prime is 163540519. The reversal of 163540517 is 715045361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 715045361 = 21019 ⋅34019.

It is a cyclic number.

It is not a de Polignac number, because 163540517 - 2¹² = 163536421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163540519) 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, 11681459 + ... + 11681472.

It is an arithmetic number, because the mean of its divisors is an integer number (46725864).

Almost surely, 2^163540517 is an apocalyptic number.

It is an amenable number.

163540517 is a deficient number, since it is larger than the sum of its proper divisors (23362939).

163540517 is an equidigital number, since it uses as much as digits as its factorization.

163540517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23362938.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 163540517 is about 12788.2960944764. The cubic root of 163540517 is about 546.8586954682.

Adding to 163540517 its reverse (715045361), we get a palindrome (878585878).

The spelling of 163540517 in words is "one hundred sixty-three million, five hundred forty thousand, five hundred seventeen".