1687171087 has 12 divisors (see below), whose sum is σ = 1963517760. Its totient is φ = 1445490816.

The previous prime is 1687171081. The next prime is 1687171093. The reversal of 1687171087 is 7801717861.

It is an interprime number because it is at equal distance from previous prime (1687171081) and next prime (1687171093).

It is a de Polignac number, because none of the positive numbers 2^k-1687171087 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 (1687171081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123714 + ... + 136672.

It is an arithmetic number, because the mean of its divisors is an integer number (163626480).

Almost surely, 2^1687171087 is an apocalyptic number.

1687171087 is a deficient number, since it is larger than the sum of its proper divisors (276346673).

1687171087 is a wasteful number, since it uses less digits than its factorization.

1687171087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15630 (or 15623 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 46.

The square root of 1687171087 is about 41075.1882162456. The cubic root of 1687171087 is about 1190.4734333068.

The spelling of 1687171087 in words is "one billion, six hundred eighty-seven million, one hundred seventy-one thousand, eighty-seven".