654779217 has 4 divisors (see below), whose sum is σ = 873038960. Its totient is φ = 436519476.

The previous prime is 654779207. The next prime is 654779219. The reversal of 654779217 is 712977456.

It is a happy number.

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 654779217 - 2⁴ = 654779201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654779219) 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, 109129867 + ... + 109129872.

It is an arithmetic number, because the mean of its divisors is an integer number (218259740).

Almost surely, 2^654779217 is an apocalyptic number.

It is an amenable number.

654779217 is a deficient number, since it is larger than the sum of its proper divisors (218259743).

654779217 is a wasteful number, since it uses less digits than its factorization.

654779217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218259742.

The product of its digits is 740880, while the sum is 48.

The square root of 654779217 is about 25588.6540677700. The cubic root of 654779217 is about 868.3569716963.

The spelling of 654779217 in words is "six hundred fifty-four million, seven hundred seventy-nine thousand, two hundred seventeen".