1031681 has 8 divisors (see below), whose sum is σ = 1241280. Its totient is φ = 837648.

The previous prime is 1031677. The next prime is 1031707. The reversal of 1031681 is 1861301.

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

It is not a de Polignac number, because 1031681 - 2² = 1031677 is a prime.

It is a super-2 number, since 2×1031681² = 2128731371522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1031081) 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, 3746 + ... + 4011.

It is an arithmetic number, because the mean of its divisors is an integer number (155160).

2^1031681 is an apocalyptic number.

It is an amenable number.

1031681 is a deficient number, since it is larger than the sum of its proper divisors (209599).

1031681 is an equidigital number, since it uses as much as digits as its factorization.

1031681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7783.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1031681 is about 1015.7169881419. The cubic root of 1031681 is about 101.0450735002.

Adding to 1031681 its reverse (1861301), we get a palindrome (2892982).

The spelling of 1031681 in words is "one million, thirty-one thousand, six hundred eighty-one".