654979 has 4 divisors (see below), whose sum is σ = 705376. Its totient is φ = 604584.

The previous prime is 654967. The next prime is 654991. The reversal of 654979 is 979456.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (654967) and next prime (654991).

It is a cyclic number.

It is not a de Polignac number, because 654979 - 2¹¹ = 652931 is a prime.

It is a Duffinian number.

654979 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (654679) 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, 25179 + ... + 25204.

It is an arithmetic number, because the mean of its divisors is an integer number (176344).

2⁶⁵⁴⁹⁷⁹ is an apocalyptic number.

654979 is a deficient number, since it is larger than the sum of its proper divisors (50397).

654979 is a wasteful number, since it uses less digits than its factorization.

654979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50396.

The product of its digits is 68040, while the sum is 40.

The square root of 654979 is about 809.3077288646. The cubic root of 654979 is about 86.8445278979.

The spelling of 654979 in words is "six hundred fifty-four thousand, nine hundred seventy-nine".