164531789 has 2 divisors, whose sum is σ = 164531790. Its totient is φ = 164531788.

The previous prime is 164531771. The next prime is 164531791. The reversal of 164531789 is 987135461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162129289 + 2402500 = 12733^2 + 1550^2 .

It is a cyclic number.

It is not a de Polignac number, because 164531789 - 2⁸ = 164531533 is a prime.

Together with 164531791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164531749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82265894 + 82265895.

It is an arithmetic number, because the mean of its divisors is an integer number (82265895).

Almost surely, 2^164531789 is an apocalyptic number.

It is an amenable number.

164531789 is a deficient number, since it is larger than the sum of its proper divisors (1).

164531789 is an equidigital number, since it uses as much as digits as its factorization.

164531789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 164531789 is about 12826.9945427602. The cubic root of 164531789 is about 547.9613664224.

The spelling of 164531789 in words is "one hundred sixty-four million, five hundred thirty-one thousand, seven hundred eighty-nine".