163990213 has 2 divisors, whose sum is σ = 163990214. Its totient is φ = 163990212.

The previous prime is 163990171. The next prime is 163990219. The reversal of 163990213 is 312099361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96864964 + 67125249 = 9842^2 + 8193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163990213 is a prime.

It is equal to p_9185731 and since 163990213 and 9185731 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163990219) 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, 81995106 + 81995107.

It is an arithmetic number, because the mean of its divisors is an integer number (81995107).

Almost surely, 2^163990213 is an apocalyptic number.

It is an amenable number.

163990213 is a deficient number, since it is larger than the sum of its proper divisors (1).

163990213 is an equidigital number, since it uses as much as digits as its factorization.

163990213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 163990213 is about 12805.8663510127. The cubic root of 163990213 is about 547.3594788206.

The spelling of 163990213 in words is "one hundred sixty-three million, nine hundred ninety thousand, two hundred thirteen".