164246521 has 4 divisors (see below), whose sum is σ = 164414592. Its totient is φ = 164078452.

The previous prime is 164246513. The next prime is 164246543. The reversal of 164246521 is 125642461.

It is a happy number.

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 164246521 - 2³ = 164246513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164246591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82561 + ... + 84526.

It is an arithmetic number, because the mean of its divisors is an integer number (41103648).

Almost surely, 2^164246521 is an apocalyptic number.

It is an amenable number.

164246521 is a deficient number, since it is larger than the sum of its proper divisors (168071).

164246521 is an equidigital number, since it uses as much as digits as its factorization.

164246521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168070.

The product of its digits is 11520, while the sum is 31.

The square root of 164246521 is about 12815.8698885405. The cubic root of 164246521 is about 547.6444949895.

Adding to 164246521 its reverse (125642461), we get a palindrome (289888982).

The spelling of 164246521 in words is "one hundred sixty-four million, two hundred forty-six thousand, five hundred twenty-one".