164609091 has 40 divisors (see below), whose sum is σ = 258746400. Its totient is φ = 104087808.

The previous prime is 164609089. The next prime is 164609111. The reversal of 164609091 is 190906461.

164609091 is a `hidden beast` number, since 1 + 646 + 0 + 9 + 0 + 9 + 1 = 666.

It is not a de Polignac number, because 164609091 - 2¹ = 164609089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (164609791) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 277291 + ... + 277883.

It is an arithmetic number, because the mean of its divisors is an integer number (6468660).

Almost surely, 2^164609091 is an apocalyptic number.

164609091 is a deficient number, since it is larger than the sum of its proper divisors (94137309).

164609091 is a wasteful number, since it uses less digits than its factorization.

164609091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 164609091 is about 12830.0074434897. The cubic root of 164609091 is about 548.0471692486.

The spelling of 164609091 in words is "one hundred sixty-four million, six hundred nine thousand, ninety-one".