1689935641 has 4 divisors (see below), whose sum is σ = 1699272484. Its totient is φ = 1680598800.

The previous prime is 1689935629. The next prime is 1689935651. The reversal of 1689935641 is 1465399861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99920016 + 1590015625 = 9996^2 + 39875^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689935641 - 2¹⁵ = 1689902873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1689935651) 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 in 3 ways as a sum of consecutive naturals, for example, 4668150 + ... + 4668511.

It is an arithmetic number, because the mean of its divisors is an integer number (424818121).

Almost surely, 2^1689935641 is an apocalyptic number.

It is an amenable number.

1689935641 is a deficient number, since it is larger than the sum of its proper divisors (9336843).

1689935641 is an equidigital number, since it uses as much as digits as its factorization.

1689935641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9336842.

The product of its digits is 1399680, while the sum is 52.

The square root of 1689935641 is about 41108.8268015520. The cubic root of 1689935641 is about 1191.1233045946.

The spelling of 1689935641 in words is "one billion, six hundred eighty-nine million, nine hundred thirty-five thousand, six hundred forty-one".