4651681 has 8 divisors (see below), whose sum is σ = 4878720. Its totient is φ = 4426752.

The previous prime is 4651663. The next prime is 4651709. The reversal of 4651681 is 1861564.

It is the 881-st star number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4651681 - 2⁷ = 4651553 is a prime.

It is a super-2 number, since 2×4651681² = 43276272251522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

4651681 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4651601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5665 + ... + 6433.

It is an arithmetic number, because the mean of its divisors is an integer number (609840).

Almost surely, 2^4651681 is an apocalyptic number.

It is an amenable number.

4651681 is a deficient number, since it is larger than the sum of its proper divisors (227039).

4651681 is a wasteful number, since it uses less digits than its factorization.

4651681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055.

The product of its digits is 5760, while the sum is 31.

The square root of 4651681 is about 2156.7756026068. The cubic root of 4651681 is about 166.9308640882.

The spelling of 4651681 in words is "four million, six hundred fifty-one thousand, six hundred eighty-one".