1687171109 has 24 divisors (see below), whose sum is σ = 1865545920. Its totient is φ = 1524811392.

The previous prime is 1687171093. The next prime is 1687171121. The reversal of 1687171109 is 9011717861.

It is not a de Polignac number, because 1687171109 - 2⁴ = 1687171093 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 (1687171609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2010512 + ... + 2011350.

It is an arithmetic number, because the mean of its divisors is an integer number (77731080).

Almost surely, 2^1687171109 is an apocalyptic number.

It is an amenable number.

1687171109 is a deficient number, since it is larger than the sum of its proper divisors (178374811).

1687171109 is a wasteful number, since it uses less digits than its factorization.

1687171109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101 (or 1088 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 41.

The square root of 1687171109 is about 41075.1884840472. The cubic root of 1687171109 is about 1190.4734384812.

The spelling of 1687171109 in words is "one billion, six hundred eighty-seven million, one hundred seventy-one thousand, one hundred nine".