164497989 has 4 divisors (see below), whose sum is σ = 219330656. Its totient is φ = 109665324.

The previous prime is 164497973. The next prime is 164498003. The reversal of 164497989 is 989794461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989794461 = 3 ⋅329931487.

It is not a de Polignac number, because 164497989 - 2⁴ = 164497973 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 (164497969) 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, 27416329 + ... + 27416334.

It is an arithmetic number, because the mean of its divisors is an integer number (54832664).

Almost surely, 2^164497989 is an apocalyptic number.

It is an amenable number.

164497989 is a deficient number, since it is larger than the sum of its proper divisors (54832667).

164497989 is an equidigital number, since it uses as much as digits as its factorization.

164497989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54832666.

The product of its digits is 3919104, while the sum is 57.

The square root of 164497989 is about 12825.6769411989. The cubic root of 164497989 is about 547.9238410244.

The spelling of 164497989 in words is "one hundred sixty-four million, four hundred ninety-seven thousand, nine hundred eighty-nine".