164724521 has 8 divisors (see below), whose sum is σ = 177495360. Its totient is φ = 151967952.

The previous prime is 164724517. The next prime is 164724569. The reversal of 164724521 is 125427461.

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

It is a cyclic number.

It is not a de Polignac number, because 164724521 - 2² = 164724517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164724121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43190 + ... + 46848.

It is an arithmetic number, because the mean of its divisors is an integer number (22186920).

Almost surely, 2^164724521 is an apocalyptic number.

It is an amenable number.

164724521 is a deficient number, since it is larger than the sum of its proper divisors (12770839).

164724521 is a wasteful number, since it uses less digits than its factorization.

164724521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7135.

The product of its digits is 13440, while the sum is 32.

The square root of 164724521 is about 12834.5050936918. The cubic root of 164724521 is about 548.1752429840.

The spelling of 164724521 in words is "one hundred sixty-four million, seven hundred twenty-four thousand, five hundred twenty-one".