163136521 has 4 divisors (see below), whose sum is σ = 163389312. Its totient is φ = 162883732.

The previous prime is 163136503. The next prime is 163136551. The reversal of 163136521 is 125631361.

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.

It is a cyclic number.

It is not a de Polignac number, because 163136521 - 2¹⁵ = 163103753 is a prime.

It is a super-2 number, since 2×163136521² = 53227048967966882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163136521.

It is not an unprimeable number, because it can be changed into a prime (163136551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125425 + ... + 126718.

It is an arithmetic number, because the mean of its divisors is an integer number (40847328).

Almost surely, 2^163136521 is an apocalyptic number.

It is an amenable number.

163136521 is a deficient number, since it is larger than the sum of its proper divisors (252791).

163136521 is an equidigital number, since it uses as much as digits as its factorization.

163136521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252790.

The product of its digits is 3240, while the sum is 28.

The square root of 163136521 is about 12772.4907907581. The cubic root of 163136521 is about 546.4080204090.

Adding to 163136521 its reverse (125631361), we get a palindrome (288767882).

The spelling of 163136521 in words is "one hundred sixty-three million, one hundred thirty-six thousand, five hundred twenty-one".