163604621 has 2 divisors, whose sum is σ = 163604622. Its totient is φ = 163604620.

The previous prime is 163604593. The next prime is 163604657. The reversal of 163604621 is 126406361.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162282121 + 1322500 = 12739^2 + 1150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163604621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163604671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81802310 + 81802311.

It is an arithmetic number, because the mean of its divisors is an integer number (81802311).

Almost surely, 2^163604621 is an apocalyptic number.

It is an amenable number.

163604621 is a deficient number, since it is larger than the sum of its proper divisors (1).

163604621 is an equidigital number, since it uses as much as digits as its factorization.

163604621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 163604621 is about 12790.8022031458. The cubic root of 163604621 is about 546.9301380096.

The spelling of 163604621 in words is "one hundred sixty-three million, six hundred four thousand, six hundred twenty-one".