163128091 has 16 divisors (see below), whose sum is σ = 199471360. Its totient is φ = 130286880.

The previous prime is 163128089. The next prime is 163128131. The reversal of 163128091 is 190821361.

163128091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 163128091 - 2¹ = 163128089 is a prime.

It is a super-2 number, since 2×163128091² = 53221548146608562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163128391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1941 + ... + 18166.

It is an arithmetic number, because the mean of its divisors is an integer number (12466960).

Almost surely, 2^163128091 is an apocalyptic number.

163128091 is a deficient number, since it is larger than the sum of its proper divisors (36343269).

163128091 is a wasteful number, since it uses less digits than its factorization.

163128091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20194.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 163128091 is about 12772.1607803848. The cubic root of 163128091 is about 546.3986084577.

The spelling of 163128091 in words is "one hundred sixty-three million, one hundred twenty-eight thousand, ninety-one".