164521535 has 4 divisors (see below), whose sum is σ = 197425848. Its totient is φ = 131617224.

The previous prime is 164521531. The next prime is 164521537. The reversal of 164521535 is 535125461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 164521535 - 2² = 164521531 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 (164521531) 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, 16452149 + ... + 16452158.

It is an arithmetic number, because the mean of its divisors is an integer number (49356462).

Almost surely, 2^164521535 is an apocalyptic number.

164521535 is a deficient number, since it is larger than the sum of its proper divisors (32904313).

164521535 is an equidigital number, since it uses as much as digits as its factorization.

164521535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32904312.

The product of its digits is 18000, while the sum is 32.

The square root of 164521535 is about 12826.5948326124. The cubic root of 164521535 is about 547.9499827811.

Adding to 164521535 its reverse (535125461), we get a palindrome (699646996).

The spelling of 164521535 in words is "one hundred sixty-four million, five hundred twenty-one thousand, five hundred thirty-five".