648927161 has 2 divisors, whose sum is σ = 648927162. Its totient is φ = 648927160.

The previous prime is 648927157. The next prime is 648927269. The reversal of 648927161 is 161729846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 633277225 + 15649936 = 25165^2 + 3956^2 .

It is a cyclic number.

It is not a de Polignac number, because 648927161 - 2² = 648927157 is a prime.

It is a super-2 number, since 2×648927161² = 842212920567039842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (648927151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324463580 + 324463581.

It is an arithmetic number, because the mean of its divisors is an integer number (324463581).

Almost surely, 2^648927161 is an apocalyptic number.

It is an amenable number.

648927161 is a deficient number, since it is larger than the sum of its proper divisors (1).

648927161 is an equidigital number, since it uses as much as digits as its factorization.

648927161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 648927161 is about 25474.0487751751. The cubic root of 648927161 is about 865.7622607969.

The spelling of 648927161 in words is "six hundred forty-eight million, nine hundred twenty-seven thousand, one hundred sixty-one".