648538349 has 2 divisors, whose sum is σ = 648538350. Its totient is φ = 648538348.

The previous prime is 648538333. The next prime is 648538361. The reversal of 648538349 is 943835846.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 437562724 + 210975625 = 20918^2 + 14525^2 .

It is a cyclic number.

It is not a de Polignac number, because 648538349 - 2⁴ = 648538333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 648538297 and 648538306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648538309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324269174 + 324269175.

It is an arithmetic number, because the mean of its divisors is an integer number (324269175).

Almost surely, 2^648538349 is an apocalyptic number.

It is an amenable number.

648538349 is a deficient number, since it is larger than the sum of its proper divisors (1).

648538349 is an equidigital number, since it uses as much as digits as its factorization.

648538349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 50.

The square root of 648538349 is about 25466.4161004253. The cubic root of 648538349 is about 865.5893158562.

The spelling of 648538349 in words is "six hundred forty-eight million, five hundred thirty-eight thousand, three hundred forty-nine".