163421517 has 12 divisors (see below), whose sum is σ = 253470336. Its totient is φ = 93383640.

The previous prime is 163421507. The next prime is 163421519. The reversal of 163421517 is 715124361.

It is not a de Polignac number, because 163421517 - 2¹² = 163417421 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163421519) 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 11 ways as a sum of consecutive naturals, for example, 555709 + ... + 556002.

It is an arithmetic number, because the mean of its divisors is an integer number (21122528).

Almost surely, 2^163421517 is an apocalyptic number.

It is an amenable number.

163421517 is a deficient number, since it is larger than the sum of its proper divisors (90048819).

163421517 is a wasteful number, since it uses less digits than its factorization.

163421517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111728 (or 1111721 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 163421517 is about 12783.6425560167. The cubic root of 163421517 is about 546.7260229934.

Adding to 163421517 its reverse (715124361), we get a palindrome (878545878).

The spelling of 163421517 in words is "one hundred sixty-three million, four hundred twenty-one thousand, five hundred seventeen".