648971287 has 2 divisors, whose sum is σ = 648971288. Its totient is φ = 648971286.

The previous prime is 648971263. The next prime is 648971303. The reversal of 648971287 is 782179846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648971287 - 2¹¹ = 648969239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648971207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324485643 + 324485644.

It is an arithmetic number, because the mean of its divisors is an integer number (324485644).

Almost surely, 2^648971287 is an apocalyptic number.

648971287 is a deficient number, since it is larger than the sum of its proper divisors (1).

648971287 is an equidigital number, since it uses as much as digits as its factorization.

648971287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 52.

The square root of 648971287 is about 25474.9148575613. The cubic root of 648971287 is about 865.7818838311.

The spelling of 648971287 in words is "six hundred forty-eight million, nine hundred seventy-one thousand, two hundred eighty-seven".