4075681 has 4 divisors (see below), whose sum is σ = 4079764. Its totient is φ = 4071600.

The previous prime is 4075679. The next prime is 4075693. The reversal of 4075681 is 1865704.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 893025 + 3182656 = 945^2 + 1784^2 .

It is a cyclic number.

It is not a de Polignac number, because 4075681 - 2¹ = 4075679 is a prime.

It is a super-2 number, since 2×4075681² = 33222351227522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4045681) 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, 571 + ... + 2911.

It is an arithmetic number, because the mean of its divisors is an integer number (1019941).

Almost surely, 2^4075681 is an apocalyptic number.

It is an amenable number.

4075681 is a deficient number, since it is larger than the sum of its proper divisors (4083).

4075681 is a wasteful number, since it uses less digits than its factorization.

4075681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 4075681 is about 2018.8315927784. The cubic root of 4075681 is about 159.7349909938.

The spelling of 4075681 in words is "four million, seventy-five thousand, six hundred eighty-one".