1688131 has 8 divisors (see below), whose sum is σ = 1854720. Its totient is φ = 1529352.

The previous prime is 1688123. The next prime is 1688143. The reversal of 1688131 is 1318861.

It is a happy number.

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 1688131 - 2³ = 1688123 is a prime.

It is a super-2 number, since 2×1688131² = 5699572546322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1688131.

It is not an unprimeable number, because it can be changed into a prime (1688101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1495 + ... + 2368.

It is an arithmetic number, because the mean of its divisors is an integer number (231840).

2^1688131 is an apocalyptic number.

1688131 is a deficient number, since it is larger than the sum of its proper divisors (166589).

1688131 is a wasteful number, since it uses less digits than its factorization.

1688131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905.

The product of its digits is 1152, while the sum is 28.

The square root of 1688131 is about 1299.2809549901. The cubic root of 1688131 is about 119.0699163086.

The spelling of 1688131 in words is "one million, six hundred eighty-eight thousand, one hundred thirty-one".