601681 has 4 divisors (see below), whose sum is σ = 637092. Its totient is φ = 566272.

The previous prime is 601669. The next prime is 601687. The reversal of 601681 is 186106.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186106 = 2 ⋅93053.

It can be written as a sum of positive squares in 2 ways, for example, as 555025 + 46656 = 745^2 + 216^2 .

It is a cyclic number.

It is not a de Polignac number, because 601681 - 2¹⁵ = 568913 is a prime.

It is a super-2 number, since 2×601681² = 724040051522, which contains 22 as substring.

601681 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (601687) 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, 17680 + ... + 17713.

It is an arithmetic number, because the mean of its divisors is an integer number (159273).

2⁶⁰¹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

601681 is a deficient number, since it is larger than the sum of its proper divisors (35411).

601681 is a wasteful number, since it uses less digits than its factorization.

601681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35410.

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

The square root of 601681 is about 775.6809911297. The cubic root of 601681 is about 84.4219603241.

Adding to 601681 its reverse (186106), we get a palindrome (787787).

The spelling of 601681 in words is "six hundred one thousand, six hundred eighty-one".