164415521 has 8 divisors (see below), whose sum is σ = 167133120. Its totient is φ = 161705808.

The previous prime is 164415499. The next prime is 164415527. The reversal of 164415521 is 125514461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164415521 is a prime.

It is a super-3 number, since 3×164415521³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164415527) 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 7 ways as a sum of consecutive naturals, for example, 51860 + ... + 54938.

It is an arithmetic number, because the mean of its divisors is an integer number (20891640).

Almost surely, 2^164415521 is an apocalyptic number.

It is an amenable number.

164415521 is a deficient number, since it is larger than the sum of its proper divisors (2717599).

164415521 is an equidigital number, since it uses as much as digits as its factorization.

164415521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3943.

The product of its digits is 4800, while the sum is 29.

The square root of 164415521 is about 12822.4615811474. The cubic root of 164415521 is about 547.8322619180.

Adding to 164415521 its reverse (125514461), we get a palindrome (289929982).

The spelling of 164415521 in words is "one hundred sixty-four million, four hundred fifteen thousand, five hundred twenty-one".