648956813 has 2 divisors, whose sum is σ = 648956814. Its totient is φ = 648956812.

The previous prime is 648956783. The next prime is 648956843. The reversal of 648956813 is 318659846.

It is a balanced prime because it is at equal distance from previous prime (648956783) and next prime (648956843).

It can be written as a sum of positive squares in only one way, i.e., 500774884 + 148181929 = 22378^2 + 12173^2 .

It is a cyclic number.

It is not a de Polignac number, because 648956813 - 2¹⁰ = 648955789 is a prime.

It is a super-2 number, since 2×648956813² = 842289890278233938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648956843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324478406 + 324478407.

It is an arithmetic number, because the mean of its divisors is an integer number (324478407).

Almost surely, 2^648956813 is an apocalyptic number.

It is an amenable number.

648956813 is a deficient number, since it is larger than the sum of its proper divisors (1).

648956813 is an equidigital number, since it uses as much as digits as its factorization.

648956813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 50.

The square root of 648956813 is about 25474.6307725941. The cubic root of 648956813 is about 865.7754472751.

The spelling of 648956813 in words is "six hundred forty-eight million, nine hundred fifty-six thousand, eight hundred thirteen".