654661 has 4 divisors (see below), whose sum is σ = 748192. Its totient is φ = 561132.

The previous prime is 654629. The next prime is 654671. The reversal of 654661 is 166456.

654661 is nontrivially palindromic in base 9.

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 a cyclic number.

It is not a de Polignac number, because 654661 - 2⁵ = 654629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654601) 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, 46755 + ... + 46768.

It is an arithmetic number, because the mean of its divisors is an integer number (187048).

2⁶⁵⁴⁶⁶¹ is an apocalyptic number.

It is an amenable number.

654661 is a deficient number, since it is larger than the sum of its proper divisors (93531).

654661 is an equidigital number, since it uses as much as digits as its factorization.

654661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93530.

The product of its digits is 4320, while the sum is 28.

The square root of 654661 is about 809.1112408068. Note that the first 3 decimals coincide. The cubic root of 654661 is about 86.8304709431.

The spelling of 654661 in words is "six hundred fifty-four thousand, six hundred sixty-one".