648396971 has 2 divisors, whose sum is σ = 648396972. Its totient is φ = 648396970.

The previous prime is 648396901. The next prime is 648396977. The reversal of 648396971 is 179693846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648396971 - 2¹⁰ = 648395947 is a prime.

It is not a weakly prime, because it can be changed into another prime (648396977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324198485 + 324198486.

It is an arithmetic number, because the mean of its divisors is an integer number (324198486).

Almost surely, 2^648396971 is an apocalyptic number.

648396971 is a deficient number, since it is larger than the sum of its proper divisors (1).

648396971 is an equidigital number, since it uses as much as digits as its factorization.

648396971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 648396971 is about 25463.6401757486. The cubic root of 648396971 is about 865.5264132898.

The spelling of 648396971 in words is "six hundred forty-eight million, three hundred ninety-six thousand, nine hundred seventy-one".