654909217 has 4 divisors (see below), whose sum is σ = 659908656. Its totient is φ = 649909780.

The previous prime is 654909179. The next prime is 654909293. The reversal of 654909217 is 712909456.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654909217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654900217) 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, 2499523 + ... + 2499784.

It is an arithmetic number, because the mean of its divisors is an integer number (164977164).

Almost surely, 2^654909217 is an apocalyptic number.

It is an amenable number.

654909217 is a deficient number, since it is larger than the sum of its proper divisors (4999439).

654909217 is a wasteful number, since it uses less digits than its factorization.

654909217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4999438.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 654909217 is about 25591.1941300128. The cubic root of 654909217 is about 868.4144358172.

The spelling of 654909217 in words is "six hundred fifty-four million, nine hundred nine thousand, two hundred seventeen".