164724121 has 2 divisors, whose sum is σ = 164724122. Its totient is φ = 164724120.

The previous prime is 164724083. The next prime is 164724163. The reversal of 164724121 is 121427461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160376896 + 4347225 = 12664^2 + 2085^2 .

It is a cyclic number.

It is not a de Polignac number, because 164724121 - 2¹⁷ = 164593049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 164724121.

It is not a weakly prime, because it can be changed into another prime (164724191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82362060 + 82362061.

It is an arithmetic number, because the mean of its divisors is an integer number (82362061).

Almost surely, 2^164724121 is an apocalyptic number.

It is an amenable number.

164724121 is a deficient number, since it is larger than the sum of its proper divisors (1).

164724121 is an equidigital number, since it uses as much as digits as its factorization.

164724121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 164724121 is about 12834.4895106895. The cubic root of 164724121 is about 548.1747992729.

The spelling of 164724121 in words is "one hundred sixty-four million, seven hundred twenty-four thousand, one hundred twenty-one".