164654989 has 2 divisors, whose sum is σ = 164654990. Its totient is φ = 164654988.

The previous prime is 164654977. The next prime is 164655019. The reversal of 164654989 is 989456461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124434025 + 40220964 = 11155^2 + 6342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164654989 is a prime.

It is a super-2 number, since 2×164654989² = 54222530805180242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164654929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82327494 + 82327495.

It is an arithmetic number, because the mean of its divisors is an integer number (82327495).

Almost surely, 2^164654989 is an apocalyptic number.

It is an amenable number.

164654989 is a deficient number, since it is larger than the sum of its proper divisors (1).

164654989 is an equidigital number, since it uses as much as digits as its factorization.

164654989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 52.

The square root of 164654989 is about 12831.7960161468. The cubic root of 164654989 is about 548.0981018981.

The spelling of 164654989 in words is "one hundred sixty-four million, six hundred fifty-four thousand, nine hundred eighty-nine".