164336521 has 4 divisors (see below), whose sum is σ = 164363472. Its totient is φ = 164309572.

The previous prime is 164336519. The next prime is 164336563. The reversal of 164336521 is 125633461.

164336521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 164336521 - 2¹ = 164336519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164306521) 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, 510 + ... + 18136.

It is an arithmetic number, because the mean of its divisors is an integer number (41090868).

Almost surely, 2^164336521 is an apocalyptic number.

It is an amenable number.

164336521 is a deficient number, since it is larger than the sum of its proper divisors (26951).

164336521 is an equidigital number, since it uses as much as digits as its factorization.

164336521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26950.

The product of its digits is 12960, while the sum is 31.

The square root of 164336521 is about 12819.3806792684. The cubic root of 164336521 is about 547.7445052351.

Adding to 164336521 its reverse (125633461), we get a palindrome (289969982).

The spelling of 164336521 in words is "one hundred sixty-four million, three hundred thirty-six thousand, five hundred twenty-one".