163487221 has 2 divisors, whose sum is σ = 163487222. Its totient is φ = 163487220.

The previous prime is 163487183. The next prime is 163487263. The reversal of 163487221 is 122784361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152794321 + 10692900 = 12361^2 + 3270^2 .

It is a cyclic number.

It is not a de Polignac number, because 163487221 - 2¹⁵ = 163454453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163487281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81743610 + 81743611.

It is an arithmetic number, because the mean of its divisors is an integer number (81743611).

Almost surely, 2^163487221 is an apocalyptic number.

It is an amenable number.

163487221 is a deficient number, since it is larger than the sum of its proper divisors (1).

163487221 is an equidigital number, since it uses as much as digits as its factorization.

163487221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 163487221 is about 12786.2121443374. The cubic root of 163487221 is about 546.7992839980.

The spelling of 163487221 in words is "one hundred sixty-three million, four hundred eighty-seven thousand, two hundred twenty-one".