163589381 has 2 divisors, whose sum is σ = 163589382. Its totient is φ = 163589380.

The previous prime is 163589369. The next prime is 163589383. The reversal of 163589381 is 183985361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107848225 + 55741156 = 10385^2 + 7466^2 .

It is a cyclic number.

It is not a de Polignac number, because 163589381 - 2¹⁸ = 163327237 is a prime.

It is a super-2 number, since 2×163589381² = 53522971151926322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 163589383, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163589383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81794690 + 81794691.

It is an arithmetic number, because the mean of its divisors is an integer number (81794691).

Almost surely, 2^163589381 is an apocalyptic number.

It is an amenable number.

163589381 is a deficient number, since it is larger than the sum of its proper divisors (1).

163589381 is an equidigital number, since it uses as much as digits as its factorization.

163589381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 163589381 is about 12790.2064486857. The cubic root of 163589381 is about 546.9131550456.

The spelling of 163589381 in words is "one hundred sixty-three million, five hundred eighty-nine thousand, three hundred eighty-one".