1687385911 has 2 divisors, whose sum is σ = 1687385912. Its totient is φ = 1687385910.

The previous prime is 1687385863. The next prime is 1687385927. The reversal of 1687385911 is 1195837861.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1195837861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1687385911 - 2⁷ = 1687385783 is a prime.

It is a super-3 number, since 3×1687385911³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1687485911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843692955 + 843692956.

It is an arithmetic number, because the mean of its divisors is an integer number (843692956).

Almost surely, 2^1687385911 is an apocalyptic number.

1687385911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687385911 is an equidigital number, since it uses as much as digits as its factorization.

1687385911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 49.

The square root of 1687385911 is about 41077.8031423298. The cubic root of 1687385911 is about 1190.5239580013.

The spelling of 1687385911 in words is "one billion, six hundred eighty-seven million, three hundred eighty-five thousand, nine hundred eleven".