164118989 has 4 divisors (see below), whose sum is σ = 164292156. Its totient is φ = 163945824.

The previous prime is 164118973. The next prime is 164119001. The reversal of 164118989 is 989811461.

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 98346889 + 65772100 = 9917^2 + 8110^2 .

It is a cyclic number.

It is not a de Polignac number, because 164118989 - 2⁴ = 164118973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164118919) 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, 85154 + ... + 87059.

It is an arithmetic number, because the mean of its divisors is an integer number (41073039).

Almost surely, 2^164118989 is an apocalyptic number.

It is an amenable number.

164118989 is a deficient number, since it is larger than the sum of its proper divisors (173167).

164118989 is an equidigital number, since it uses as much as digits as its factorization.

164118989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173166.

The product of its digits is 124416, while the sum is 47.

The square root of 164118989 is about 12810.8933724389. The cubic root of 164118989 is about 547.5027156652.

The spelling of 164118989 in words is "one hundred sixty-four million, one hundred eighteen thousand, nine hundred eighty-nine".