163513521 has 12 divisors (see below), whose sum is σ = 237752320. Its totient is φ = 108286200.

The previous prime is 163513501. The next prime is 163513573. The reversal of 163513521 is 125315361.

163513521 is a `hidden beast` number, since 1 + 635 + 1 + 3 + 5 + 21 = 666.

163513521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 163513521 - 2¹⁵ = 163480753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163513501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58801 + ... + 61518.

Almost surely, 2^163513521 is an apocalyptic number.

It is an amenable number.

163513521 is a deficient number, since it is larger than the sum of its proper divisors (74238799).

163513521 is a wasteful number, since it uses less digits than its factorization.

163513521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120476 (or 120473 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 163513521 is about 12787.2405545528. The cubic root of 163513521 is about 546.8286034151.

Adding to 163513521 its reverse (125315361), we get a palindrome (288828882).

The spelling of 163513521 in words is "one hundred sixty-three million, five hundred thirteen thousand, five hundred twenty-one".