1689601601 has 2 divisors, whose sum is σ = 1689601602. Its totient is φ = 1689601600.

The previous prime is 1689601561. The next prime is 1689601603. The reversal of 1689601601 is 1061069861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1610818225 + 78783376 = 40135^2 + 8876^2 .

It is an emirp because it is prime and its reverse (1061069861) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1091096891 and 1986901901.

It is a cyclic number.

It is not a de Polignac number, because 1689601601 - 2¹⁴ = 1689585217 is a prime.

Together with 1689601603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1689601603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844800800 + 844800801.

It is an arithmetic number, because the mean of its divisors is an integer number (844800801).

Almost surely, 2^1689601601 is an apocalyptic number.

It is an amenable number.

1689601601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689601601 is an equidigital number, since it uses as much as digits as its factorization.

1689601601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1689601601 is about 41104.7637263614. The cubic root of 1689601601 is about 1191.0448185589.

The spelling of 1689601601 in words is "one billion, six hundred eighty-nine million, six hundred one thousand, six hundred one".