1691442805 has 16 divisors (see below), whose sum is σ = 2218495104. Its totient is φ = 1230419520.

The previous prime is 1691442803. The next prime is 1691442817. The reversal of 1691442805 is 5082441961.

It is not a de Polignac number, because 1691442805 - 2¹ = 1691442803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691442803) 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 15 ways as a sum of consecutive naturals, for example, 189841 + ... + 198550.

It is an arithmetic number, because the mean of its divisors is an integer number (138655944).

Almost surely, 2^1691442805 is an apocalyptic number.

It is an amenable number.

1691442805 is a deficient number, since it is larger than the sum of its proper divisors (527052299).

1691442805 is a wasteful number, since it uses less digits than its factorization.

1691442805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388476.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 1691442805 is about 41127.1541077182. The cubic root of 1691442805 is about 1191.4772992870.

The spelling of 1691442805 in words is "one billion, six hundred ninety-one million, four hundred forty-two thousand, eight hundred five".