1687161 has 8 divisors (see below), whose sum is σ = 2570944. Its totient is φ = 964080.

The previous prime is 1687157. The next prime is 1687171. The reversal of 1687161 is 1617861.

It is a happy number.

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

It is not a de Polignac number, because 1687161 - 2² = 1687157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1687111) 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, 40150 + ... + 40191.

It is an arithmetic number, because the mean of its divisors is an integer number (321368).

2^1687161 is an apocalyptic number.

It is an amenable number.

1687161 is a deficient number, since it is larger than the sum of its proper divisors (883783).

1687161 is an equidigital number, since it uses as much as digits as its factorization.

1687161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80351.

The product of its digits is 2016, while the sum is 30.

The square root of 1687161 is about 1298.9076179621. The cubic root of 1687161 is about 119.0471060829.

The spelling of 1687161 in words is "one million, six hundred eighty-seven thousand, one hundred sixty-one".