1085681 has 2 divisors, whose sum is σ = 1085682. Its totient is φ = 1085680.

The previous prime is 1085677. The next prime is 1085687. The reversal of 1085681 is 1865801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1018081 + 67600 = 1009^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1085681 - 2² = 1085677 is a prime.

It is a super-2 number, since 2×1085681² = 2357406467522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1085687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542840 + 542841.

It is an arithmetic number, because the mean of its divisors is an integer number (542841).

2^1085681 is an apocalyptic number.

It is an amenable number.

1085681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085681 is an equidigital number, since it uses as much as digits as its factorization.

1085681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 1085681 is about 1041.9601719836. The cubic root of 1085681 is about 102.7781380936.

The spelling of 1085681 in words is "one million, eighty-five thousand, six hundred eighty-one".