164203121 has 4 divisors (see below), whose sum is σ = 164577600. Its totient is φ = 163828644.

The previous prime is 164203093. The next prime is 164203177. The reversal of 164203121 is 121302461.

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 a de Polignac number, because none of the positive numbers 2^k-164203121 is a prime.

It is a super-2 number, since 2×164203121² = 53925329892281282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164203093 and 164203102.

It is not an unprimeable number, because it can be changed into a prime (164203421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186581 + ... + 187458.

It is an arithmetic number, because the mean of its divisors is an integer number (41144400).

Almost surely, 2^164203121 is an apocalyptic number.

It is an amenable number.

164203121 is a deficient number, since it is larger than the sum of its proper divisors (374479).

164203121 is an equidigital number, since it uses as much as digits as its factorization.

164203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374478.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 164203121 is about 12814.1765634784. The cubic root of 164203121 is about 547.5962547696.

Adding to 164203121 its reverse (121302461), we get a palindrome (285505582).

The spelling of 164203121 in words is "one hundred sixty-four million, two hundred three thousand, one hundred twenty-one".