1687171213 has 8 divisors (see below), whose sum is σ = 2076518528. Its totient is φ = 1334904624.

The previous prime is 1687171201. The next prime is 1687171223. The reversal of 1687171213 is 3121717861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1687171213 - 2⁹ = 1687170701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687171223) 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 7 ways as a sum of consecutive naturals, for example, 9270081 + ... + 9270262.

It is an arithmetic number, because the mean of its divisors is an integer number (259564816).

Almost surely, 2^1687171213 is an apocalyptic number.

1687171213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1687171213 is a deficient number, since it is larger than the sum of its proper divisors (389347315).

1687171213 is a wasteful number, since it uses less digits than its factorization.

1687171213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18540363.

The product of its digits is 14112, while the sum is 37.

The square root of 1687171213 is about 41075.1897500182. The cubic root of 1687171213 is about 1190.4734629421.

The spelling of 1687171213 in words is "one billion, six hundred eighty-seven million, one hundred seventy-one thousand, two hundred thirteen".