1685898911 has 2 divisors, whose sum is σ = 1685898912. Its totient is φ = 1685898910.

The previous prime is 1685898869. The next prime is 1685898913. The reversal of 1685898911 is 1198985861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1685898911 - 2¹⁰ = 1685897887 is a prime.

It is a super-2 number, since 2×1685898911² = 5684510276221971842, which contains 22 as substring.

Together with 1685898913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685898913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842949455 + 842949456.

It is an arithmetic number, because the mean of its divisors is an integer number (842949456).

Almost surely, 2^1685898911 is an apocalyptic number.

1685898911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685898911 is an equidigital number, since it uses as much as digits as its factorization.

1685898911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 56.

The square root of 1685898911 is about 41059.6993535023. The cubic root of 1685898911 is about 1190.1741408880.

The spelling of 1685898911 in words is "one billion, six hundred eighty-five million, eight hundred ninety-eight thousand, nine hundred eleven".