1001685691 has 2 divisors, whose sum is σ = 1001685692. Its totient is φ = 1001685690.

The previous prime is 1001685689. The next prime is 1001685701. The reversal of 1001685691 is 1965861001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1001685691 - 2¹ = 1001685689 is a prime.

Together with 1001685689, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1001685691.

It is not a weakly prime, because it can be changed into another prime (1001685631) 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, 500842845 + 500842846.

It is an arithmetic number, because the mean of its divisors is an integer number (500842846).

Almost surely, 2^1001685691 is an apocalyptic number.

1001685691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001685691 is an equidigital number, since it uses as much as digits as its factorization.

1001685691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 1001685691 is about 31649.4184938681. The cubic root of 1001685691 is about 1000.5615815671.

The spelling of 1001685691 in words is "one billion, one million, six hundred eighty-five thousand, six hundred ninety-one".