654321617 has 2 divisors, whose sum is σ = 654321618. Its totient is φ = 654321616.

The previous prime is 654321599. The next prime is 654321643. The reversal of 654321617 is 716123456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 629809216 + 24512401 = 25096^2 + 4951^2 .

It is a cyclic number.

It is not a de Polignac number, because 654321617 - 2⁶ = 654321553 is a prime.

It is not a weakly prime, because it can be changed into another prime (654321667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327160808 + 327160809.

It is an arithmetic number, because the mean of its divisors is an integer number (327160809).

Almost surely, 2^654321617 is an apocalyptic number.

It is an amenable number.

654321617 is a deficient number, since it is larger than the sum of its proper divisors (1).

654321617 is an equidigital number, since it uses as much as digits as its factorization.

654321617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 654321617 is about 25579.7110421521. The cubic root of 654321617 is about 868.1546374629.

The spelling of 654321617 in words is "six hundred fifty-four million, three hundred twenty-one thousand, six hundred seventeen".