648959851 has 2 divisors, whose sum is σ = 648959852. Its totient is φ = 648959850.

The previous prime is 648959833. The next prime is 648959873. The reversal of 648959851 is 158959846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648959851 - 2⁷ = 648959723 is a prime.

It is a super-2 number, since 2×648959851² = 842297776419884402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 648959792 and 648959801.

It is not a weakly prime, because it can be changed into another prime (648959251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324479925 + 324479926.

It is an arithmetic number, because the mean of its divisors is an integer number (324479926).

Almost surely, 2^648959851 is an apocalyptic number.

648959851 is a deficient number, since it is larger than the sum of its proper divisors (1).

648959851 is an equidigital number, since it uses as much as digits as its factorization.

648959851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3110400, while the sum is 55.

The square root of 648959851 is about 25474.6904004740. The cubic root of 648959851 is about 865.7767982750.

The spelling of 648959851 in words is "six hundred forty-eight million, nine hundred fifty-nine thousand, eight hundred fifty-one".