648459397 has 2 divisors, whose sum is σ = 648459398. Its totient is φ = 648459396.

The previous prime is 648459391. The next prime is 648459443. The reversal of 648459397 is 793954846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 571879396 + 76580001 = 23914^2 + 8751^2 .

It is a cyclic number.

It is not a de Polignac number, because 648459397 - 2³ = 648459389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648459391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324229698 + 324229699.

It is an arithmetic number, because the mean of its divisors is an integer number (324229699).

Almost surely, 2^648459397 is an apocalyptic number.

It is an amenable number.

648459397 is a deficient number, since it is larger than the sum of its proper divisors (1).

648459397 is an equidigital number, since it uses as much as digits as its factorization.

648459397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 55.

The square root of 648459397 is about 25464.8659332815. The cubic root of 648459397 is about 865.5541892873.

The spelling of 648459397 in words is "six hundred forty-eight million, four hundred fifty-nine thousand, three hundred ninety-seven".