164304421 has 2 divisors, whose sum is σ = 164304422. Its totient is φ = 164304420.

The previous prime is 164304409. The next prime is 164304431. The reversal of 164304421 is 124403461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152152225 + 12152196 = 12335^2 + 3486^2 .

It is a cyclic number.

It is not a de Polignac number, because 164304421 - 2¹³ = 164296229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164304431) 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 as a sum of consecutive naturals, namely, 82152210 + 82152211.

It is an arithmetic number, because the mean of its divisors is an integer number (82152211).

Almost surely, 2^164304421 is an apocalyptic number.

It is an amenable number.

164304421 is a deficient number, since it is larger than the sum of its proper divisors (1).

164304421 is an equidigital number, since it uses as much as digits as its factorization.

164304421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 164304421 is about 12818.1286075620. The cubic root of 164304421 is about 547.7088391043.

Adding to 164304421 its reverse (124403461), we get a palindrome (288707882).

The spelling of 164304421 in words is "one hundred sixty-four million, three hundred four thousand, four hundred twenty-one".