163505213 has 4 divisors (see below), whose sum is σ = 163847040. Its totient is φ = 163163388.

The previous prime is 163505207. The next prime is 163505239. The reversal of 163505213 is 312505361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 312505361 = 7 ⋅44643623.

It is a cyclic number.

It is not a de Polignac number, because 163505213 - 2¹⁶ = 163439677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163505263) 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 in 3 ways as a sum of consecutive naturals, for example, 170195 + ... + 171152.

It is an arithmetic number, because the mean of its divisors is an integer number (40961760).

Almost surely, 2^163505213 is an apocalyptic number.

It is an amenable number.

163505213 is a deficient number, since it is larger than the sum of its proper divisors (341827).

163505213 is an equidigital number, since it uses as much as digits as its factorization.

163505213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341826.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 163505213 is about 12786.9156953505. The cubic root of 163505213 is about 546.8193419405.

The spelling of 163505213 in words is "one hundred sixty-three million, five hundred five thousand, two hundred thirteen".