163405089 has 9 divisors (see below), whose sum is σ = 236084979. Its totient is φ = 108911160.

The previous prime is 163405079. The next prime is 163405091. The reversal of 163405089 is 980504361.

The square root of 163405089 is 12783.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 157929489 + 5475600 = 12567^2 + 2340^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 163405089 - 2⁷ = 163404961 is a prime.

It is a super-2 number, since 2×163405089² = 53402446222195842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163405079) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 36219 + ... + 40479.

Almost surely, 2^163405089 is an apocalyptic number.

163405089 is the 12783-rd square number.

163405089 is the 6392-nd centered octagonal number.

It is an amenable number.

163405089 is a deficient number, since it is larger than the sum of its proper divisors (72679890).

163405089 is an frugal number, since it uses more digits than its factorization.

163405089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8528 (or 4264 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The cubic root of 163405089 is about 546.7077024437.

Multiplying 163405089 by its sum of digits (36), we get a square (5882583204 = 76698²).

The spelling of 163405089 in words is "one hundred sixty-three million, four hundred five thousand, eighty-nine".