163505893 has 2 divisors, whose sum is σ = 163505894. Its totient is φ = 163505892.

The previous prime is 163505869. The next prime is 163505899. The reversal of 163505893 is 398505361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112211649 + 51294244 = 10593^2 + 7162^2 .

It is a cyclic number.

It is not a de Polignac number, because 163505893 - 2⁵ = 163505861 is a prime.

It is equal to p_9159970 and since 163505893 and 9159970 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 (163505899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81752946 + 81752947.

It is an arithmetic number, because the mean of its divisors is an integer number (81752947).

Almost surely, 2^163505893 is an apocalyptic number.

It is an amenable number.

163505893 is a deficient number, since it is larger than the sum of its proper divisors (1).

163505893 is an equidigital number, since it uses as much as digits as its factorization.

163505893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 163505893 is about 12786.9422850031. The cubic root of 163505893 is about 546.8200999931.

The spelling of 163505893 in words is "one hundred sixty-three million, five hundred five thousand, eight hundred ninety-three".