4621681 has 4 divisors (see below), whose sum is σ = 4673700. Its totient is φ = 4569664.

The previous prime is 4621679. The next prime is 4621691. The reversal of 4621681 is 1861264.

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 2944656 + 1677025 = 1716^2 + 1295^2 .

It is a cyclic number.

It is not a de Polignac number, because 4621681 - 2¹ = 4621679 is a prime.

It is a super-2 number, since 2×4621681² = 42719870531522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

4621681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4621621) 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, 25876 + ... + 26053.

It is an arithmetic number, because the mean of its divisors is an integer number (1168425).

Almost surely, 2^4621681 is an apocalyptic number.

It is an amenable number.

4621681 is a deficient number, since it is larger than the sum of its proper divisors (52019).

4621681 is an equidigital number, since it uses as much as digits as its factorization.

4621681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52018.

The product of its digits is 2304, while the sum is 28.

The square root of 4621681 is about 2149.8095264465. The cubic root of 4621681 is about 166.5712284708.

The spelling of 4621681 in words is "four million, six hundred twenty-one thousand, six hundred eighty-one".