654861 has 4 divisors (see below), whose sum is σ = 873152. Its totient is φ = 436572.

The previous prime is 654853. The next prime is 654877. The reversal of 654861 is 168456.

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 654861 - 2³ = 654853 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654821) 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, 109141 + ... + 109146.

It is an arithmetic number, because the mean of its divisors is an integer number (218288).

2⁶⁵⁴⁸⁶¹ is an apocalyptic number.

It is an amenable number.

654861 is a deficient number, since it is larger than the sum of its proper divisors (218291).

654861 is a wasteful number, since it uses less digits than its factorization.

654861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218290.

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

The square root of 654861 is about 809.2348237687. The cubic root of 654861 is about 86.8393123262.

The spelling of 654861 in words is "six hundred fifty-four thousand, eight hundred sixty-one".