1681131 has 8 divisors (see below), whose sum is σ = 2248000. Its totient is φ = 1117512.

The previous prime is 1681129. The next prime is 1681151. The reversal of 1681131 is 1311861.

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

It is not a de Polignac number, because 1681131 - 2¹ = 1681129 is a prime.

It is a super-2 number, since 2×1681131² = 5652402878322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1681098 and 1681107.

It is not an unprimeable number, because it can be changed into a prime (1681151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 936 + ... + 2058.

It is an arithmetic number, because the mean of its divisors is an integer number (281000).

2^1681131 is an apocalyptic number.

1681131 is a deficient number, since it is larger than the sum of its proper divisors (566869).

1681131 is a wasteful number, since it uses less digits than its factorization.

1681131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625.

The product of its digits is 144, while the sum is 21.

The square root of 1681131 is about 1296.5843589987. The cubic root of 1681131 is about 118.9051099589.

Adding to 1681131 its reverse (1311861), we get a palindrome (2992992).

The spelling of 1681131 in words is "one million, six hundred eighty-one thousand, one hundred thirty-one".