654961 has 4 divisors (see below), whose sum is σ = 658800. Its totient is φ = 651124.

The previous prime is 654943. The next prime is 654967. The reversal of 654961 is 169456.

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 654961 - 2¹¹ = 652913 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

654961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (654967) 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, 1651 + ... + 2008.

It is an arithmetic number, because the mean of its divisors is an integer number (164700).

2⁶⁵⁴⁹⁶¹ is an apocalyptic number.

It is an amenable number.

654961 is a deficient number, since it is larger than the sum of its proper divisors (3839).

654961 is a wasteful number, since it uses less digits than its factorization.

654961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3838.

The product of its digits is 6480, while the sum is 31.

The square root of 654961 is about 809.2966081728. The cubic root of 654961 is about 86.8437323427.

The spelling of 654961 in words is "six hundred fifty-four thousand, nine hundred sixty-one".