163705091 has 4 divisors (see below), whose sum is σ = 178587384. Its totient is φ = 148822800.

The previous prime is 163705063. The next prime is 163705093. The reversal of 163705091 is 190507361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163705091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163705093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7441130 + ... + 7441151.

It is an arithmetic number, because the mean of its divisors is an integer number (44646846).

Almost surely, 2^163705091 is an apocalyptic number.

163705091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

163705091 is a deficient number, since it is larger than the sum of its proper divisors (14882293).

163705091 is a wasteful number, since it uses less digits than its factorization.

163705091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14882292.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 163705091 is about 12794.7290319100. The cubic root of 163705091 is about 547.0420721472.

The spelling of 163705091 in words is "one hundred sixty-three million, seven hundred five thousand, ninety-one".