654681 has 4 divisors (see below), whose sum is σ = 872912. Its totient is φ = 436452.

The previous prime is 654679. The next prime is 654697. The reversal of 654681 is 186456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 654681 - 2¹ = 654679 is a prime.

It is a super-2 number, since 2×654681² = 857214423522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109111 + ... + 109116.

It is an arithmetic number, because the mean of its divisors is an integer number (218228).

2⁶⁵⁴⁶⁸¹ is an apocalyptic number.

It is an amenable number.

654681 is a deficient number, since it is larger than the sum of its proper divisors (218231).

654681 is a wasteful number, since it uses less digits than its factorization.

654681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218230.

The product of its digits is 5760, while the sum is 30.

The square root of 654681 is about 809.1235999524. The cubic root of 654681 is about 86.8313551625.

The spelling of 654681 in words is "six hundred fifty-four thousand, six hundred eighty-one".