1691685011 has 4 divisors (see below), whose sum is σ = 1791195912. Its totient is φ = 1592174112.

The previous prime is 1691684999. The next prime is 1691685013. The reversal of 1691685011 is 1105861961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1105861961 = 14431 ⋅76631.

It is a cyclic number.

It is not a de Polignac number, because 1691685011 - 2³⁰ = 617943187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1691685013) 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 in 3 ways as a sum of consecutive naturals, for example, 49755425 + ... + 49755458.

It is an arithmetic number, because the mean of its divisors is an integer number (447798978).

Almost surely, 2^1691685011 is an apocalyptic number.

1691685011 is a deficient number, since it is larger than the sum of its proper divisors (99510901).

1691685011 is an equidigital number, since it uses as much as digits as its factorization.

1691685011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99510900.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 1691685011 is about 41130.0986018755. The cubic root of 1691685011 is about 1191.5341677341.

The spelling of 1691685011 in words is "one billion, six hundred ninety-one million, six hundred eighty-five thousand, eleven".