163459081 has 4 divisors (see below), whose sum is σ = 167876932. Its totient is φ = 159041232.

The previous prime is 163459073. The next prime is 163459117. The reversal of 163459081 is 180954361.

It is the 5220-th star number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 109935225 + 53523856 = 10485^2 + 7316^2 .

It is a cyclic number.

It is not a de Polignac number, because 163459081 - 2³ = 163459073 is a prime.

It is a super-2 number, since 2×163459081² = 53437742322729122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 4417813 = 163459081 / (1 + 6 + 3 + 4 + 5 + 9 + 0 + 8 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163459081.

It is not an unprimeable number, because it can be changed into a prime (163459181) 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, 2208870 + ... + 2208943.

It is an arithmetic number, because the mean of its divisors is an integer number (41969233).

Almost surely, 2^163459081 is an apocalyptic number.

It is an amenable number.

163459081 is a deficient number, since it is larger than the sum of its proper divisors (4417851).

163459081 is an equidigital number, since it uses as much as digits as its factorization.

163459081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4417850.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 163459081 is about 12785.1116929028. Note that the first 3 decimals coincide. The cubic root of 163459081 is about 546.7679098542.

The spelling of 163459081 in words is "one hundred sixty-three million, four hundred fifty-nine thousand, eighty-one".