649612289 has 2 divisors, whose sum is σ = 649612290. Its totient is φ = 649612288.

The previous prime is 649612283. The next prime is 649612297. The reversal of 649612289 is 982216946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643890625 + 5721664 = 25375^2 + 2392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649612289 is a prime.

It is a super-2 number, since 2×649612289² = 843992252039639042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (649612283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324806144 + 324806145.

It is an arithmetic number, because the mean of its divisors is an integer number (324806145).

Almost surely, 2^649612289 is an apocalyptic number.

It is an amenable number.

649612289 is a deficient number, since it is larger than the sum of its proper divisors (1).

649612289 is an equidigital number, since it uses as much as digits as its factorization.

649612289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 47.

The square root of 649612289 is about 25487.4927954870. The cubic root of 649612289 is about 866.0668400959.

The spelling of 649612289 in words is "six hundred forty-nine million, six hundred twelve thousand, two hundred eighty-nine".