163230581 has 2 divisors, whose sum is σ = 163230582. Its totient is φ = 163230580.

The previous prime is 163230523. The next prime is 163230611. The reversal of 163230581 is 185032361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138886225 + 24344356 = 11785^2 + 4934^2 .

It is an emirp because it is prime and its reverse (185032361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163230581 - 2¹⁸ = 162968437 is a prime.

It is a super-2 number, since 2×163230581² = 53288445147195122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163230281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81615290 + 81615291.

It is an arithmetic number, because the mean of its divisors is an integer number (81615291).

Almost surely, 2^163230581 is an apocalyptic number.

It is an amenable number.

163230581 is a deficient number, since it is larger than the sum of its proper divisors (1).

163230581 is an equidigital number, since it uses as much as digits as its factorization.

163230581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 163230581 is about 12776.1723923873. The cubic root of 163230581 is about 546.5130148100.

The spelling of 163230581 in words is "one hundred sixty-three million, two hundred thirty thousand, five hundred eighty-one".