163704421 has 2 divisors, whose sum is σ = 163704422. Its totient is φ = 163704420.

The previous prime is 163704377. The next prime is 163704467. The reversal of 163704421 is 124407361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159744321 + 3960100 = 12639^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 163704421 - 2⁷ = 163704293 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163704421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163704481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81852210 + 81852211.

It is an arithmetic number, because the mean of its divisors is an integer number (81852211).

Almost surely, 2^163704421 is an apocalyptic number.

It is an amenable number.

163704421 is a deficient number, since it is larger than the sum of its proper divisors (1).

163704421 is an equidigital number, since it uses as much as digits as its factorization.

163704421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 163704421 is about 12794.7028492263. The cubic root of 163704421 is about 547.0413258485.

The spelling of 163704421 in words is "one hundred sixty-three million, seven hundred four thousand, four hundred twenty-one".