648149521 has 2 divisors, whose sum is σ = 648149522. Its totient is φ = 648149520.

The previous prime is 648149501. The next prime is 648149539. The reversal of 648149521 is 125941846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 347300496 + 300849025 = 18636^2 + 17345^2 .

It is a cyclic number.

It is not a de Polignac number, because 648149521 - 2⁷ = 648149393 is a prime.

It is not a weakly prime, because it can be changed into another prime (648149501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324074760 + 324074761.

It is an arithmetic number, because the mean of its divisors is an integer number (324074761).

Almost surely, 2^648149521 is an apocalyptic number.

It is an amenable number.

648149521 is a deficient number, since it is larger than the sum of its proper divisors (1).

648149521 is an equidigital number, since it uses as much as digits as its factorization.

648149521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 40.

The square root of 648149521 is about 25458.7808231266. The cubic root of 648149521 is about 865.4162946579.

The spelling of 648149521 in words is "six hundred forty-eight million, one hundred forty-nine thousand, five hundred twenty-one".