648394867 has 2 divisors, whose sum is σ = 648394868. Its totient is φ = 648394866.

The previous prime is 648394823. The next prime is 648394883. The reversal of 648394867 is 768493846.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648394867 is a prime.

It is not a weakly prime, because it can be changed into another prime (648394897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324197433 + 324197434.

It is an arithmetic number, because the mean of its divisors is an integer number (324197434).

Almost surely, 2^648394867 is an apocalyptic number.

648394867 is a deficient number, since it is larger than the sum of its proper divisors (1).

648394867 is an equidigital number, since it uses as much as digits as its factorization.

648394867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 55.

The square root of 648394867 is about 25463.5988619048. The cubic root of 648394867 is about 865.5254770991.

The spelling of 648394867 in words is "six hundred forty-eight million, three hundred ninety-four thousand, eight hundred sixty-seven".