1689620173 has 2 divisors, whose sum is σ = 1689620174. Its totient is φ = 1689620172.

The previous prime is 1689620171. The next prime is 1689620197. The reversal of 1689620173 is 3710269861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1406775049 + 282845124 = 37507^2 + 16818^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689620173 - 2¹ = 1689620171 is a prime.

Together with 1689620171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1689620171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844810086 + 844810087.

It is an arithmetic number, because the mean of its divisors is an integer number (844810087).

Almost surely, 2^1689620173 is an apocalyptic number.

It is an amenable number.

1689620173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689620173 is an equidigital number, since it uses as much as digits as its factorization.

1689620173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 1689620173 is about 41104.9896362960. The cubic root of 1689620173 is about 1191.0491825075.

The spelling of 1689620173 in words is "one billion, six hundred eighty-nine million, six hundred twenty thousand, one hundred seventy-three".