163611421 has 2 divisors, whose sum is σ = 163611422. Its totient is φ = 163611420.

The previous prime is 163611389. The next prime is 163611467. The reversal of 163611421 is 124116361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163558521 + 52900 = 12789^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 163611421 - 2⁵ = 163611389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163611491) 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, 81805710 + 81805711.

It is an arithmetic number, because the mean of its divisors is an integer number (81805711).

Almost surely, 2^163611421 is an apocalyptic number.

It is an amenable number.

163611421 is a deficient number, since it is larger than the sum of its proper divisors (1).

163611421 is an equidigital number, since it uses as much as digits as its factorization.

163611421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 163611421 is about 12791.0680163933. The cubic root of 163611421 is about 546.9377153697.

Adding to 163611421 its reverse (124116361), we get a palindrome (287727782).

The spelling of 163611421 in words is "one hundred sixty-three million, six hundred eleven thousand, four hundred twenty-one".