1600681 has 4 divisors (see below), whose sum is σ = 1639764. Its totient is φ = 1561600.

The previous prime is 1600663. The next prime is 1600691. The reversal of 1600681 is 1860061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 774400 + 826281 = 880^2 + 909^2 .

It is a cyclic number.

It is not a de Polignac number, because 1600681 - 2⁵ = 1600649 is a prime.

It is a super-2 number, since 2×1600681² = 5124359327522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1600631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19480 + ... + 19561.

It is an arithmetic number, because the mean of its divisors is an integer number (409941).

2^1600681 is an apocalyptic number.

It is an amenable number.

1600681 is a deficient number, since it is larger than the sum of its proper divisors (39083).

1600681 is an equidigital number, since it uses as much as digits as its factorization.

1600681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39082.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1600681 is about 1265.1802243159. The cubic root of 1600681 is about 116.9773009755.

The spelling of 1600681 in words is "one million, six hundred thousand, six hundred eighty-one".